157252309 has 2 divisors, whose sum is σ = 157252310. Its totient is φ = 157252308.

The previous prime is 157252307. The next prime is 157252313. The reversal of 157252309 is 903252751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137405284 + 19847025 = 11722^2 + 4455^2 .

It is a cyclic number.

It is not a de Polignac number, because 157252309 - 2¹ = 157252307 is a prime.

Together with 157252307, 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 (157252301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78626154 + 78626155.

It is an arithmetic number, because the mean of its divisors is an integer number (78626155).

Almost surely, 2^157252309 is an apocalyptic number.

It is an amenable number.

157252309 is a deficient number, since it is larger than the sum of its proper divisors (1).

157252309 is an equidigital number, since it uses as much as digits as its factorization.

157252309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 157252309 is about 12540.0282695056. The cubic root of 157252309 is about 539.7579035950.

The spelling of 157252309 in words is "one hundred fifty-seven million, two hundred fifty-two thousand, three hundred nine".