51131572 has 6 divisors (see below), whose sum is σ = 89480258. Its totient is φ = 25565784.

The previous prime is 51131557. The next prime is 51131581. The reversal of 51131572 is 27513115.

It can be written as a sum of positive squares in only one way, i.e., 47941776 + 3189796 = 6924^2 + 1786^2 .

It is a super-2 number, since 2×51131572² = 5228875310382368, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 6391443 + ... + 6391450.

Almost surely, 2^51131572 is an apocalyptic number.

It is an amenable number.

51131572 is a deficient number, since it is larger than the sum of its proper divisors (38348686).

51131572 is a wasteful number, since it uses less digits than its factorization.

51131572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12782897 (or 12782895 counting only the distinct ones).

The product of its digits is 1050, while the sum is 25.

The square root of 51131572 is about 7150.6343774521. The cubic root of 51131572 is about 371.1616086466.

Adding to 51131572 its reverse (27513115), we get a palindrome (78644687).

The spelling of 51131572 in words is "fifty-one million, one hundred thirty-one thousand, five hundred seventy-two".