51539956 has 24 divisors (see below), whose sum is σ = 98970984. Its totient is φ = 23337600.

The previous prime is 51539923. The next prime is 51539959. The reversal of 51539956 is 65993515.

It can be written as a sum of positive squares in 4 ways, for example, as 902500 + 50637456 = 950^2 + 7116^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51539959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6595 + ... + 12106.

It is an arithmetic number, because the mean of its divisors is an integer number (4123791).

Almost surely, 2^51539956 is an apocalyptic number.

It is an amenable number.

51539956 is a deficient number, since it is larger than the sum of its proper divisors (47431028).

51539956 is a wasteful number, since it uses less digits than its factorization.

51539956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18771 (or 18769 counting only the distinct ones).

The product of its digits is 182250, while the sum is 43.

The square root of 51539956 is about 7179.1333738830. The cubic root of 51539956 is about 372.1471360767.

The spelling of 51539956 in words is "fifty-one million, five hundred thirty-nine thousand, nine hundred fifty-six".