99390631 has 2 divisors, whose sum is σ = 99390632. Its totient is φ = 99390630.

The previous prime is 99390583. The next prime is 99390671. The reversal of 99390631 is 13609399.

It is an a-pointer prime, because the next prime (99390671) can be obtained adding 99390631 to its sum of digits (40).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99390631 - 2²¹ = 97293479 is a prime.

It is a super-2 number, since 2×99390631² = 19756995061156322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99390671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49695315 + 49695316.

It is an arithmetic number, because the mean of its divisors is an integer number (49695316).

Almost surely, 2^99390631 is an apocalyptic number.

99390631 is a deficient number, since it is larger than the sum of its proper divisors (1).

99390631 is an equidigital number, since it uses as much as digits as its factorization.

99390631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 99390631 is about 9969.4849917135. The cubic root of 99390631 is about 463.2141483320.

The spelling of 99390631 in words is "ninety-nine million, three hundred ninety thousand, six hundred thirty-one".