51401520 has 160 divisors (see below), whose sum is σ = 180792000. Its totient is φ = 13418496.

The previous prime is 51401513. The next prime is 51401521. The reversal of 51401520 is 2510415.

51401520 is a `hidden beast` number, since 5 + 140 + 1 + 520 = 666.

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 = 51401493 and 51401502.

It is not an unprimeable number, because it can be changed into a prime (51401521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114256 + ... + 114704.

It is an arithmetic number, because the mean of its divisors is an integer number (1129950).

Almost surely, 2^51401520 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 51401520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90396000).

51401520 is an abundant number, since it is smaller than the sum of its proper divisors (129390480).

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

51401520 is a wasteful number, since it uses less digits than its factorization.

51401520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51401520 is about 7169.4853371773. The cubic root of 51401520 is about 371.8136423496.

Adding to 51401520 its reverse (2510415), we get a palindrome (53911935).

The spelling of 51401520 in words is "fifty-one million, four hundred one thousand, five hundred twenty".