99938431 has 2 divisors, whose sum is σ = 99938432. Its totient is φ = 99938430.

The previous prime is 99938401. The next prime is 99938441. The reversal of 99938431 is 13483999.

It is a strong prime.

It is an emirp because it is prime and its reverse (13483999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99938431 is a prime.

It is a super-2 number, since 2×99938431² = 19975379981483522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99938401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49969215 + 49969216.

It is an arithmetic number, because the mean of its divisors is an integer number (49969216).

Almost surely, 2^99938431 is an apocalyptic number.

99938431 is a deficient number, since it is larger than the sum of its proper divisors (1).

99938431 is an equidigital number, since it uses as much as digits as its factorization.

99938431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 46.

The square root of 99938431 is about 9996.9210760114. The cubic root of 99938431 is about 464.0636044769.

The spelling of 99938431 in words is "ninety-nine million, nine hundred thirty-eight thousand, four hundred thirty-one".