99451631 has 2 divisors, whose sum is σ = 99451632. Its totient is φ = 99451630.

The previous prime is 99451621. The next prime is 99451657. The reversal of 99451631 is 13615499.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99451631 - 2¹⁴ = 99435247 is a prime.

It is a super-2 number, since 2×99451631² = 19781253817120322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99451601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49725815 + 49725816.

It is an arithmetic number, because the mean of its divisors is an integer number (49725816).

Almost surely, 2^99451631 is an apocalyptic number.

99451631 is a deficient number, since it is larger than the sum of its proper divisors (1).

99451631 is an equidigital number, since it uses as much as digits as its factorization.

99451631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The square root of 99451631 is about 9972.5438580134. The cubic root of 99451631 is about 463.3088932930.

It can be divided in two parts, 994 and 51631, that added together give a palindrome (52625).

The spelling of 99451631 in words is "ninety-nine million, four hundred fifty-one thousand, six hundred thirty-one".