157847521 has 6 divisors (see below), whose sum is σ = 170923830. Its totient is φ = 145705248.

The previous prime is 157847519. The next prime is 157847527. The reversal of 157847521 is 125748751.

157847521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 11316496 + 146531025 = 3364^2 + 12105^2 .

It is not a de Polignac number, because 157847521 - 2¹ = 157847519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157847527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 466836 + ... + 467173.

It is an arithmetic number, because the mean of its divisors is an integer number (28487305).

Almost surely, 2^157847521 is an apocalyptic number.

It is an amenable number.

157847521 is a deficient number, since it is larger than the sum of its proper divisors (13076309).

157847521 is an equidigital number, since it uses as much as digits as its factorization.

157847521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934035 (or 934022 counting only the distinct ones).

The product of its digits is 78400, while the sum is 40.

The square root of 157847521 is about 12563.7383369760. The cubic root of 157847521 is about 540.4380544711.

The spelling of 157847521 in words is "one hundred fifty-seven million, eight hundred forty-seven thousand, five hundred twenty-one".