99999131 has 2 divisors, whose sum is σ = 99999132. Its totient is φ = 99999130.

The previous prime is 99999113. The next prime is 99999157. The reversal of 99999131 is 13199999.

Together with previous prime (99999113) 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 99999131 - 2²² = 95804827 is a prime.

It is a super-2 number, since 2×99999131² = 19999652401510322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99999131.

It is not a weakly prime, because it can be changed into another prime (99999931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999565 + 49999566.

It is an arithmetic number, because the mean of its divisors is an integer number (49999566).

Almost surely, 2^99999131 is an apocalyptic number.

99999131 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999131 is an equidigital number, since it uses as much as digits as its factorization.

99999131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 177147, while the sum is 50.

The square root of 99999131 is about 9999.9565499056. The cubic root of 99999131 is about 464.1575388438.

The spelling of 99999131 in words is "ninety-nine million, nine hundred ninety-nine thousand, one hundred thirty-one".