51581372 has 24 divisors (see below), whose sum is σ = 95376960. Its totient is φ = 24368960.

The previous prime is 51581363. The next prime is 51581393. The reversal of 51581372 is 27318515.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 722 + ... + 10182.

It is an arithmetic number, because the mean of its divisors is an integer number (3974040).

Almost surely, 2^51581372 is an apocalyptic number.

It is an amenable number.

51581372 is a deficient number, since it is larger than the sum of its proper divisors (43795588).

51581372 is a wasteful number, since it uses less digits than its factorization.

51581372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9541 (or 9539 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

The square root of 51581372 is about 7182.0172653649. The cubic root of 51581372 is about 372.2467915698.

Adding to 51581372 its reverse (27318515), we get a palindrome (78899887).

The spelling of 51581372 in words is "fifty-one million, five hundred eighty-one thousand, three hundred seventy-two".