999900131 has 2 divisors, whose sum is σ = 999900132. Its totient is φ = 999900130.

The previous prime is 999900107. The next prime is 999900151. The reversal of 999900131 is 131009999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999900131 - 2¹⁸ = 999637987 is a prime.

It is a super-2 number, since 2×999900131² = 1999600543947634322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999900151) 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, 499950065 + 499950066.

It is an arithmetic number, because the mean of its divisors is an integer number (499950066).

Almost surely, 2^999900131 is an apocalyptic number.

999900131 is a deficient number, since it is larger than the sum of its proper divisors (1).

999900131 is an equidigital number, since it uses as much as digits as its factorization.

999900131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19683, while the sum is 41.

The square root of 999900131 is about 31621.1974947186. The cubic root of 999900131 is about 999.9667092251.

The spelling of 999900131 in words is "nine hundred ninety-nine million, nine hundred thousand, one hundred thirty-one".