99912731 has 2 divisors, whose sum is σ = 99912732. Its totient is φ = 99912730.

The previous prime is 99912727. The next prime is 99912733. The reversal of 99912731 is 13721999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99912731 - 2² = 99912727 is a prime.

It is a super-2 number, since 2×99912731² = 19965107631756722, which contains 22 as substring.

Together with 99912733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99912733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49956365 + 49956366.

It is an arithmetic number, because the mean of its divisors is an integer number (49956366).

Almost surely, 2^99912731 is an apocalyptic number.

99912731 is a deficient number, since it is larger than the sum of its proper divisors (1).

99912731 is an equidigital number, since it uses as much as digits as its factorization.

99912731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 41.

The square root of 99912731 is about 9995.6355975996. The cubic root of 99912731 is about 464.0238217927.

The spelling of 99912731 in words is "ninety-nine million, nine hundred twelve thousand, seven hundred thirty-one".