157980521 has 4 divisors (see below), whose sum is σ = 158238852. Its totient is φ = 157722192.

The previous prime is 157980499. The next prime is 157980533. The reversal of 157980521 is 125089751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70744921 + 87235600 = 8411^2 + 9340^2 .

It is a cyclic number.

It is not a de Polignac number, because 157980521 - 2²⁶ = 90871657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157988521) 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, 128246 + ... + 129471.

It is an arithmetic number, because the mean of its divisors is an integer number (39559713).

Almost surely, 2^157980521 is an apocalyptic number.

It is an amenable number.

157980521 is a deficient number, since it is larger than the sum of its proper divisors (258331).

157980521 is an equidigital number, since it uses as much as digits as its factorization.

157980521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258330.

The product of its (nonzero) digits is 25200, while the sum is 38.

The square root of 157980521 is about 12569.0302330769. The cubic root of 157980521 is about 540.5898002453.

The spelling of 157980521 in words is "one hundred fifty-seven million, nine hundred eighty thousand, five hundred twenty-one".