51321936 has 20 divisors (see below), whose sum is σ = 132581792. Its totient is φ = 17107296.

The previous prime is 51321931. The next prime is 51321943. The reversal of 51321936 is 63912315.

It is a super-2 number, since 2×51321936² = 5267882229576192, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51321931) by changing a digit.

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, 534556 + ... + 534651.

Almost surely, 2^51321936 is an apocalyptic number.

It is an amenable number.

51321936 is an abundant number, since it is smaller than the sum of its proper divisors (81259856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51321936 is a wasteful number, since it uses less digits than its factorization.

51321936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069218 (or 1069212 counting only the distinct ones).

The product of its digits is 4860, while the sum is 30.

The square root of 51321936 is about 7163.9329980116. The cubic root of 51321936 is about 371.6216525570.

The spelling of 51321936 in words is "fifty-one million, three hundred twenty-one thousand, nine hundred thirty-six".