51561116 has 12 divisors (see below), whose sum is σ = 90522432. Its totient is φ = 25697568.

The previous prime is 51561061. The next prime is 51561127. The reversal of 51561116 is 61116515.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent 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, 19340 + ... + 21843.

It is an arithmetic number, because the mean of its divisors is an integer number (7543536).

Almost surely, 2^51561116 is an apocalyptic number.

It is an amenable number.

51561116 is a deficient number, since it is larger than the sum of its proper divisors (38961316).

51561116 is a wasteful number, since it uses less digits than its factorization.

51561116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41500 (or 41498 counting only the distinct ones).

The product of its digits is 900, while the sum is 26.

The square root of 51561116 is about 7180.6069381355. The cubic root of 51561116 is about 372.1980580965.

The spelling of 51561116 in words is "fifty-one million, five hundred sixty-one thousand, one hundred sixteen".