157235909 has 2 divisors, whose sum is σ = 157235910. Its totient is φ = 157235908.

The previous prime is 157235807. The next prime is 157235921. The reversal of 157235909 is 909532751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156175009 + 1060900 = 12497^2 + 1030^2 .

It is an emirp because it is prime and its reverse (909532751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157235909 - 2⁸ = 157235653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157235929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78617954 + 78617955.

It is an arithmetic number, because the mean of its divisors is an integer number (78617955).

Almost surely, 2^157235909 is an apocalyptic number.

It is an amenable number.

157235909 is a deficient number, since it is larger than the sum of its proper divisors (1).

157235909 is an equidigital number, since it uses as much as digits as its factorization.

157235909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 85050, while the sum is 41.

The square root of 157235909 is about 12539.3743464337. The cubic root of 157235909 is about 539.7391389795.

The spelling of 157235909 in words is "one hundred fifty-seven million, two hundred thirty-five thousand, nine hundred nine".