157311521 has 2 divisors, whose sum is σ = 157311522. Its totient is φ = 157311520.

The previous prime is 157311509. The next prime is 157311527. The reversal of 157311521 is 125113751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114918400 + 42393121 = 10720^2 + 6511^2 .

It is a cyclic number.

It is not a de Polignac number, because 157311521 - 2¹⁰ = 157310497 is a prime.

It is not a weakly prime, because it can be changed into another prime (157311527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78655760 + 78655761.

It is an arithmetic number, because the mean of its divisors is an integer number (78655761).

Almost surely, 2^157311521 is an apocalyptic number.

It is an amenable number.

157311521 is a deficient number, since it is larger than the sum of its proper divisors (1).

157311521 is an equidigital number, since it uses as much as digits as its factorization.

157311521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1050, while the sum is 26.

The square root of 157311521 is about 12542.3889670190. The cubic root of 157311521 is about 539.8256421539.

The spelling of 157311521 in words is "one hundred fifty-seven million, three hundred eleven thousand, five hundred twenty-one".