51891572 has 12 divisors (see below), whose sum is σ = 92742720. Its totient is φ = 25393656.

The previous prime is 51891571. The next prime is 51891577. The reversal of 51891572 is 27519815.

It is a hoax number, since the sum of its digits (38) 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 (51891571) 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, 137822 + ... + 138197.

It is an arithmetic number, because the mean of its divisors is an integer number (7728560).

Almost surely, 2^51891572 is an apocalyptic number.

It is an amenable number.

51891572 is a deficient number, since it is larger than the sum of its proper divisors (40851148).

51891572 is a wasteful number, since it uses less digits than its factorization.

51891572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276070 (or 276068 counting only the distinct ones).

The product of its digits is 25200, while the sum is 38.

The square root of 51891572 is about 7203.5804986132. The cubic root of 51891572 is about 372.9915064898.

The spelling of 51891572 in words is "fifty-one million, eight hundred ninety-one thousand, five hundred seventy-two".