157138649 has 2 divisors, whose sum is σ = 157138650. Its totient is φ = 157138648.

The previous prime is 157138627. The next prime is 157138661. The reversal of 157138649 is 946831751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154828249 + 2310400 = 12443^2 + 1520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157138649 is a prime.

It is not a weakly prime, because it can be changed into another prime (157138679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78569324 + 78569325.

It is an arithmetic number, because the mean of its divisors is an integer number (78569325).

Almost surely, 2^157138649 is an apocalyptic number.

It is an amenable number.

157138649 is a deficient number, since it is larger than the sum of its proper divisors (1).

157138649 is an equidigital number, since it uses as much as digits as its factorization.

157138649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 157138649 is about 12535.4955626014. The cubic root of 157138649 is about 539.6278288330.

The spelling of 157138649 in words is "one hundred fifty-seven million, one hundred thirty-eight thousand, six hundred forty-nine".