157157521 has 8 divisors (see below), whose sum is σ = 158425344. Its totient is φ = 155893920.

The previous prime is 157157513. The next prime is 157157549. The reversal of 157157521 is 125751751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157157521 - 2³ = 157157513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157157821) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 151621 + ... + 152653.

It is an arithmetic number, because the mean of its divisors is an integer number (19803168).

Almost surely, 2^157157521 is an apocalyptic number.

It is an amenable number.

157157521 is a deficient number, since it is larger than the sum of its proper divisors (1267823).

157157521 is a wasteful number, since it uses less digits than its factorization.

157157521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111.

The product of its digits is 12250, while the sum is 34.

The square root of 157157521 is about 12536.2482824807. The cubic root of 157157521 is about 539.6494306664.

The spelling of 157157521 in words is "one hundred fifty-seven million, one hundred fifty-seven thousand, five hundred twenty-one".