51561412 has 12 divisors (see below), whose sum is σ = 103122880. Its totient is φ = 22097736.

The previous prime is 51561379. The next prime is 51561427. The reversal of 51561412 is 21416515.

It is a happy number.

51561412 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920712 + ... + 920767.

Almost surely, 2^51561412 is an apocalyptic number.

It is an amenable number.

51561412 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51561412 is a wasteful number, since it uses less digits than its factorization.

51561412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841490 (or 1841488 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 51561412 is about 7180.6275491770. The cubic root of 51561412 is about 372.1987703284.

Adding to 51561412 its reverse (21416515), we get a palindrome (72977927).

The spelling of 51561412 in words is "fifty-one million, five hundred sixty-one thousand, four hundred twelve".