51621157 has 24 divisors (see below), whose sum is σ = 64088000. Its totient is φ = 41446944.

The previous prime is 51621137. The next prime is 51621161. The reversal of 51621157 is 75112615.

51621157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51621157 - 2²³ = 43232549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51621127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 579969 + ... + 580057.

Almost surely, 2^51621157 is an apocalyptic number.

It is an amenable number.

51621157 is a deficient number, since it is larger than the sum of its proper divisors (12466843).

51621157 is an frugal number, since it uses more digits than its factorization.

51621157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 115 counting only the distinct ones).

The product of its digits is 2100, while the sum is 28.

The square root of 51621157 is about 7184.7864964799. The cubic root of 51621157 is about 372.3424723167.

The spelling of 51621157 in words is "fifty-one million, six hundred twenty-one thousand, one hundred fifty-seven".