97818431 has 2 divisors, whose sum is σ = 97818432. Its totient is φ = 97818430.

The previous prime is 97818397. The next prime is 97818439. The reversal of 97818431 is 13481879.

It is a strong prime.

It is an emirp because it is prime and its reverse (13481879) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97818431 is a prime.

It is a super-2 number, since 2×97818431² = 19136890886603522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97818439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48909215 + 48909216.

It is an arithmetic number, because the mean of its divisors is an integer number (48909216).

Almost surely, 2^97818431 is an apocalyptic number.

97818431 is a deficient number, since it is larger than the sum of its proper divisors (1).

97818431 is an equidigital number, since it uses as much as digits as its factorization.

97818431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 97818431 is about 9890.3200655995. The cubic root of 97818431 is about 460.7587211021.

The spelling of 97818431 in words is "ninety-seven million, eight hundred eighteen thousand, four hundred thirty-one".