51220170 has 48 divisors (see below), whose sum is σ = 133709472. Its totient is φ = 13603680.

The previous prime is 51220159. The next prime is 51220199. The reversal of 51220170 is 7102215.

51220170 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 24465 + ... + 26475.

It is an arithmetic number, because the mean of its divisors is an integer number (2785614).

Almost surely, 2^51220170 is an apocalyptic number.

51220170 is an abundant number, since it is smaller than the sum of its proper divisors (82489302).

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

51220170 is a wasteful number, since it uses less digits than its factorization.

51220170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307 (or 2304 counting only the distinct ones).

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

The square root of 51220170 is about 7156.8268108150. The cubic root of 51220170 is about 371.3758611451.

Adding to 51220170 its reverse (7102215), we get a palindrome (58322385).

The spelling of 51220170 in words is "fifty-one million, two hundred twenty thousand, one hundred seventy".