97920157 has 2 divisors, whose sum is σ = 97920158. Its totient is φ = 97920156.

The previous prime is 97920149. The next prime is 97920169. The reversal of 97920157 is 75102979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76492516 + 21427641 = 8746^2 + 4629^2 .

It is a cyclic number.

It is not a de Polignac number, because 97920157 - 2³ = 97920149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97920127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48960078 + 48960079.

It is an arithmetic number, because the mean of its divisors is an integer number (48960079).

Almost surely, 2^97920157 is an apocalyptic number.

It is an amenable number.

97920157 is a deficient number, since it is larger than the sum of its proper divisors (1).

97920157 is an equidigital number, since it uses as much as digits as its factorization.

97920157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 97920157 is about 9895.4614344153. The cubic root of 97920157 is about 460.9183873420.

The spelling of 97920157 in words is "ninety-seven million, nine hundred twenty thousand, one hundred fifty-seven".