51557965 has 4 divisors (see below), whose sum is σ = 61869564. Its totient is φ = 41246368.

The previous prime is 51557941. The next prime is 51558037. The reversal of 51557965 is 56975515.

51557965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12595401 + 38962564 = 3549^2 + 6242^2 .

It is a cyclic number.

It is not a de Polignac number, because 51557965 - 2²⁵ = 18003533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5155792 + ... + 5155801.

It is an arithmetic number, because the mean of its divisors is an integer number (15467391).

Almost surely, 2^51557965 is an apocalyptic number.

It is an amenable number.

51557965 is a deficient number, since it is larger than the sum of its proper divisors (10311599).

51557965 is a wasteful number, since it uses less digits than its factorization.

51557965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10311598.

The product of its digits is 236250, while the sum is 43.

The square root of 51557965 is about 7180.3875243611. The cubic root of 51557965 is about 372.1904760265.

The spelling of 51557965 in words is "fifty-one million, five hundred fifty-seven thousand, nine hundred sixty-five".