51561032 has 16 divisors (see below), whose sum is σ = 100880640. Its totient is φ = 24659536.

The previous prime is 51561031. The next prime is 51561047. The reversal of 51561032 is 23016515.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 51560989 and 51561007.

It is not an unprimeable number, because it can be changed into a prime (51561031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139928 + ... + 140295.

It is an arithmetic number, because the mean of its divisors is an integer number (6305040).

Almost surely, 2^51561032 is an apocalyptic number.

It is an amenable number.

51561032 is a deficient number, since it is larger than the sum of its proper divisors (49319608).

51561032 is a wasteful number, since it uses less digits than its factorization.

51561032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280252 (or 280248 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 51561032 is about 7180.6010890454. The cubic root of 51561032 is about 372.1978559762.

Adding to 51561032 its reverse (23016515), we get a palindrome (74577547).

The spelling of 51561032 in words is "fifty-one million, five hundred sixty-one thousand, thirty-two".