97919431 has 2 divisors, whose sum is σ = 97919432. Its totient is φ = 97919430.

The previous prime is 97919417. The next prime is 97919443. The reversal of 97919431 is 13491979.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13491979) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97919431 - 2¹⁹ = 97395143 is a prime.

It is a super-2 number, since 2×97919431² = 19176429934727522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97919411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48959715 + 48959716.

It is an arithmetic number, because the mean of its divisors is an integer number (48959716).

Almost surely, 2^97919431 is an apocalyptic number.

97919431 is a deficient number, since it is larger than the sum of its proper divisors (1).

97919431 is an equidigital number, since it uses as much as digits as its factorization.

97919431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 43.

The square root of 97919431 is about 9895.4247508634. The cubic root of 97919431 is about 460.9172482249.

The spelling of 97919431 in words is "ninety-seven million, nine hundred nineteen thousand, four hundred thirty-one".