99818431 has 2 divisors, whose sum is σ = 99818432. Its totient is φ = 99818430.

The previous prime is 99818393. The next prime is 99818447. The reversal of 99818431 is 13481899.

It is a strong prime.

It is an emirp because it is prime and its reverse (13481899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99818431 - 2²¹ = 97721279 is a prime.

It is a super-2 number, since 2×99818431² = 19927438334603522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99818491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49909215 + 49909216.

It is an arithmetic number, because the mean of its divisors is an integer number (49909216).

Almost surely, 2^99818431 is an apocalyptic number.

99818431 is a deficient number, since it is larger than the sum of its proper divisors (1).

99818431 is an equidigital number, since it uses as much as digits as its factorization.

99818431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 43.

The square root of 99818431 is about 9990.9174253419. The cubic root of 99818431 is about 463.8777902856.

The spelling of 99818431 in words is "ninety-nine million, eight hundred eighteen thousand, four hundred thirty-one".