157308121 has 2 divisors, whose sum is σ = 157308122. Its totient is φ = 157308120.

The previous prime is 157308113. The next prime is 157308131. The reversal of 157308121 is 121803751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139499721 + 17808400 = 11811^2 + 4220^2 .

It is a cyclic number.

It is not a de Polignac number, because 157308121 - 2³ = 157308113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 157308121.

It is not a weakly prime, because it can be changed into another prime (157308131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78654060 + 78654061.

It is an arithmetic number, because the mean of its divisors is an integer number (78654061).

Almost surely, 2^157308121 is an apocalyptic number.

It is an amenable number.

157308121 is a deficient number, since it is larger than the sum of its proper divisors (1).

157308121 is an equidigital number, since it uses as much as digits as its factorization.

157308121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 157308121 is about 12542.2534259199. The cubic root of 157308121 is about 539.8217530122.

The spelling of 157308121 in words is "one hundred fifty-seven million, three hundred eight thousand, one hundred twenty-one".