51389956 has 12 divisors (see below), whose sum is σ = 91164892. Its totient is φ = 25342848.

The previous prime is 51389953. The next prime is 51389983. The reversal of 51389956 is 65998315.

It can be written as a sum of positive squares in 2 ways, for example, as 23193856 + 28196100 = 4816^2 + 5310^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51389953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87705 + ... + 88288.

Almost surely, 2^51389956 is an apocalyptic number.

It is an amenable number.

51389956 is a deficient number, since it is larger than the sum of its proper divisors (39774936).

51389956 is a wasteful number, since it uses less digits than its factorization.

51389956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176070 (or 176068 counting only the distinct ones).

The product of its digits is 291600, while the sum is 46.

The square root of 51389956 is about 7168.6788183040. The cubic root of 51389956 is about 371.7857574710.

The spelling of 51389956 in words is "fifty-one million, three hundred eighty-nine thousand, nine hundred fifty-six".