99213431 has 2 divisors, whose sum is σ = 99213432. Its totient is φ = 99213430.

The previous prime is 99213407. The next prime is 99213451. The reversal of 99213431 is 13431299.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99213431 - 2¹⁴ = 99197047 is a prime.

It is a super-2 number, since 2×99213431² = 19686609781583522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99213451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49606715 + 49606716.

It is an arithmetic number, because the mean of its divisors is an integer number (49606716).

Almost surely, 2^99213431 is an apocalyptic number.

99213431 is a deficient number, since it is larger than the sum of its proper divisors (1).

99213431 is an equidigital number, since it uses as much as digits as its factorization.

99213431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 99213431 is about 9960.5939079956. The cubic root of 99213431 is about 462.9387019285.

The spelling of 99213431 in words is "ninety-nine million, two hundred thirteen thousand, four hundred thirty-one".