51821572 has 12 divisors (see below), whose sum is σ = 98932176. Its totient is φ = 23555240.

The previous prime is 51821557. The next prime is 51821587. The reversal of 51821572 is 27512815.

It is an interprime number because it is at equal distance from previous prime (51821557) and next prime (51821587).

It is an unprimeable number.

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, 588838 + ... + 588925.

It is an arithmetic number, because the mean of its divisors is an integer number (8244348).

Almost surely, 2^51821572 is an apocalyptic number.

It is an amenable number.

51821572 is a deficient number, since it is larger than the sum of its proper divisors (47110604).

51821572 is a wasteful number, since it uses less digits than its factorization.

51821572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177778 (or 1177776 counting only the distinct ones).

The product of its digits is 5600, while the sum is 31.

The square root of 51821572 is about 7198.7201640292. The cubic root of 51821572 is about 372.8237133172.

The spelling of 51821572 in words is "fifty-one million, eight hundred twenty-one thousand, five hundred seventy-two".