51561044 has 12 divisors (see below), whose sum is σ = 91761600. Its totient is φ = 25343448.

The previous prime is 51561031. The next prime is 51561047. The reversal of 51561044 is 44016515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51561047) 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, 109004 + ... + 109475.

It is an arithmetic number, because the mean of its divisors is an integer number (7646800).

Almost surely, 2^51561044 is an apocalyptic number.

It is an amenable number.

51561044 is a deficient number, since it is larger than the sum of its proper divisors (40200556).

51561044 is a wasteful number, since it uses less digits than its factorization.

51561044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218542 (or 218540 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 51561044 is about 7180.6019246300. The cubic root of 51561044 is about 372.1978848505.

Adding to 51561044 its reverse (44016515), we get a palindrome (95577559).

The spelling of 51561044 in words is "fifty-one million, five hundred sixty-one thousand, forty-four".