157123697 has 2 divisors, whose sum is σ = 157123698. Its totient is φ = 157123696.

The previous prime is 157123693. The next prime is 157123699. The reversal of 157123697 is 796321751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84805681 + 72318016 = 9209^2 + 8504^2 .

It is an emirp because it is prime and its reverse (796321751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157123697 - 2² = 157123693 is a prime.

Together with 157123699, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157123693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78561848 + 78561849.

It is an arithmetic number, because the mean of its divisors is an integer number (78561849).

Almost surely, 2^157123697 is an apocalyptic number.

It is an amenable number.

157123697 is a deficient number, since it is larger than the sum of its proper divisors (1).

157123697 is an equidigital number, since it uses as much as digits as its factorization.

157123697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380, while the sum is 41.

The square root of 157123697 is about 12534.8991619398. The cubic root of 157123697 is about 539.6107127993.

The spelling of 157123697 in words is "one hundred fifty-seven million, one hundred twenty-three thousand, six hundred ninety-seven".