157613509 has 2 divisors, whose sum is σ = 157613510. Its totient is φ = 157613508.

The previous prime is 157613507. The next prime is 157613527. The reversal of 157613509 is 905316751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95550625 + 62062884 = 9775^2 + 7878^2 .

It is a cyclic number.

It is not a de Polignac number, because 157613509 - 2¹ = 157613507 is a prime.

Together with 157613507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157613507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78806754 + 78806755.

It is an arithmetic number, because the mean of its divisors is an integer number (78806755).

Almost surely, 2^157613509 is an apocalyptic number.

It is an amenable number.

157613509 is a deficient number, since it is larger than the sum of its proper divisors (1).

157613509 is an equidigital number, since it uses as much as digits as its factorization.

157613509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 157613509 is about 12554.4218903142. The cubic root of 157613509 is about 540.1708524306.

The spelling of 157613509 in words is "one hundred fifty-seven million, six hundred thirteen thousand, five hundred nine".