97861157 has 2 divisors, whose sum is σ = 97861158. Its totient is φ = 97861156.

The previous prime is 97861151. The next prime is 97861187. The reversal of 97861157 is 75116879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52041796 + 45819361 = 7214^2 + 6769^2 .

It is a cyclic number.

It is not a de Polignac number, because 97861157 - 2¹² = 97857061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97861151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48930578 + 48930579.

It is an arithmetic number, because the mean of its divisors is an integer number (48930579).

Almost surely, 2^97861157 is an apocalyptic number.

It is an amenable number.

97861157 is a deficient number, since it is larger than the sum of its proper divisors (1).

97861157 is an equidigital number, since it uses as much as digits as its factorization.

97861157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 44.

The square root of 97861157 is about 9892.4798205506. The cubic root of 97861157 is about 460.8257960945.

The spelling of 97861157 in words is "ninety-seven million, eight hundred sixty-one thousand, one hundred fifty-seven".