97915381 has 2 divisors, whose sum is σ = 97915382. Its totient is φ = 97915380.

The previous prime is 97915361. The next prime is 97915387. The reversal of 97915381 is 18351979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97911025 + 4356 = 9895^2 + 66^2 .

It is a cyclic number.

It is not a de Polignac number, because 97915381 - 2⁷ = 97915253 is a prime.

It is a super-2 number, since 2×97915381² = 19174843672750322, which contains 22 as substring.

It is equal to p_5648398 and since 97915381 and 5648398 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97915387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48957690 + 48957691.

It is an arithmetic number, because the mean of its divisors is an integer number (48957691).

Almost surely, 2^97915381 is an apocalyptic number.

It is an amenable number.

97915381 is a deficient number, since it is larger than the sum of its proper divisors (1).

97915381 is an equidigital number, since it uses as much as digits as its factorization.

97915381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 43.

The square root of 97915381 is about 9895.2201087192. The cubic root of 97915381 is about 460.9108935427.

The spelling of 97915381 in words is "ninety-seven million, nine hundred fifteen thousand, three hundred eighty-one".