157085521 has 4 divisors (see below), whose sum is σ = 165353200. Its totient is φ = 148817844.

The previous prime is 157085497. The next prime is 157085549. The reversal of 157085521 is 125580751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125580751 = 17 ⋅7387103.

It is a cyclic number.

It is not a de Polignac number, because 157085521 - 2¹³ = 157077329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157085581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4133811 + ... + 4133848.

It is an arithmetic number, because the mean of its divisors is an integer number (41338300).

Almost surely, 2^157085521 is an apocalyptic number.

It is an amenable number.

157085521 is a deficient number, since it is larger than the sum of its proper divisors (8267679).

157085521 is an equidigital number, since it uses as much as digits as its factorization.

157085521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8267678.

The product of its (nonzero) digits is 14000, while the sum is 34.

The square root of 157085521 is about 12533.3762809548. The cubic root of 157085521 is about 539.5670065823.

The spelling of 157085521 in words is "one hundred fifty-seven million, eighty-five thousand, five hundred twenty-one".