157942997 has 2 divisors, whose sum is σ = 157942998. Its totient is φ = 157942996.

The previous prime is 157942987. The next prime is 157943003. The reversal of 157942997 is 799249751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114725521 + 43217476 = 10711^2 + 6574^2 .

It is a cyclic number.

It is not a de Polignac number, because 157942997 - 2⁶ = 157942933 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 (157942927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78971498 + 78971499.

It is an arithmetic number, because the mean of its divisors is an integer number (78971499).

Almost surely, 2^157942997 is an apocalyptic number.

It is an amenable number.

157942997 is a deficient number, since it is larger than the sum of its proper divisors (1).

157942997 is an equidigital number, since it uses as much as digits as its factorization.

157942997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 53.

The square root of 157942997 is about 12567.5374278337. The cubic root of 157942997 is about 540.5469960274.

The spelling of 157942997 in words is "one hundred fifty-seven million, nine hundred forty-two thousand, nine hundred ninety-seven".