157985897 has 2 divisors, whose sum is σ = 157985898. Its totient is φ = 157985896.

The previous prime is 157985887. The next prime is 157985899. The reversal of 157985897 is 798589751.

157985897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109599961 + 48385936 = 10469^2 + 6956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157985897 is a prime.

Together with 157985899, 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 (157985899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78992948 + 78992949.

It is an arithmetic number, because the mean of its divisors is an integer number (78992949).

Almost surely, 2^157985897 is an apocalyptic number.

It is an amenable number.

157985897 is a deficient number, since it is larger than the sum of its proper divisors (1).

157985897 is an equidigital number, since it uses as much as digits as its factorization.

157985897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6350400, while the sum is 59.

The square root of 157985897 is about 12569.2440902387. The cubic root of 157985897 is about 540.5959321781.

The spelling of 157985897 in words is "one hundred fifty-seven million, nine hundred eighty-five thousand, eight hundred ninety-seven".