51701220 has 96 divisors (see below), whose sum is σ = 163363200. Its totient is φ = 13571712.

The previous prime is 51701161. The next prime is 51701227. The reversal of 51701220 is 2210715.

51701220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51701220² = 5346032298976800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 51701193 and 51701202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51701227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35466 + ... + 36894.

It is an arithmetic number, because the mean of its divisors is an integer number (1701700).

Almost surely, 2^51701220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51701220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81681600).

51701220 is an abundant number, since it is smaller than the sum of its proper divisors (111661980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51701220 is a wasteful number, since it uses less digits than its factorization.

51701220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514 (or 1506 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 51701220 is about 7190.3560412541. The cubic root of 51701220 is about 372.5348705401.

Adding to 51701220 its reverse (2210715), we get a palindrome (53911935).

The spelling of 51701220 in words is "fifty-one million, seven hundred one thousand, two hundred twenty".