51572157 has 24 divisors (see below), whose sum is σ = 86145696. Its totient is φ = 27201888.

The previous prime is 51572153. The next prime is 51572159. The reversal of 51572157 is 75127515.

It is not a de Polignac number, because 51572157 - 2² = 51572153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51572153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11583 + ... + 15404.

It is an arithmetic number, because the mean of its divisors is an integer number (3589404).

Almost surely, 2^51572157 is an apocalyptic number.

It is an amenable number.

51572157 is a deficient number, since it is larger than the sum of its proper divisors (34573539).

51572157 is a wasteful number, since it uses less digits than its factorization.

51572157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27017 (or 27010 counting only the distinct ones).

The product of its digits is 12250, while the sum is 33.

The square root of 51572157 is about 7181.3757038606. The cubic root of 51572157 is about 372.2246229823.

The spelling of 51572157 in words is "fifty-one million, five hundred seventy-two thousand, one hundred fifty-seven".