99405431 has 2 divisors, whose sum is σ = 99405432. Its totient is φ = 99405430.

The previous prime is 99405413. The next prime is 99405451. The reversal of 99405431 is 13450499.

Together with previous prime (99405413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99405431 - 2⁶ = 99405367 is a prime.

It is a super-2 number, since 2×99405431² = 19762879424591522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99405391 and 99405400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99405451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49702715 + 49702716.

It is an arithmetic number, because the mean of its divisors is an integer number (49702716).

Almost surely, 2^99405431 is an apocalyptic number.

99405431 is a deficient number, since it is larger than the sum of its proper divisors (1).

99405431 is an equidigital number, since it uses as much as digits as its factorization.

99405431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 99405431 is about 9970.2272291057. The cubic root of 99405431 is about 463.2371391950.

The spelling of 99405431 in words is "ninety-nine million, four hundred five thousand, four hundred thirty-one".