99931031 has 2 divisors, whose sum is σ = 99931032. Its totient is φ = 99931030.

The previous prime is 99931003. The next prime is 99931037. The reversal of 99931031 is 13013999.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13013999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99931031 - 2¹⁸ = 99668887 is a prime.

It is a super-2 number, since 2×99931031² = 19972421913445922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 99930982 and 99931000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99931037) 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, 49965515 + 49965516.

It is an arithmetic number, because the mean of its divisors is an integer number (49965516).

Almost surely, 2^99931031 is an apocalyptic number.

99931031 is a deficient number, since it is larger than the sum of its proper divisors (1).

99931031 is an equidigital number, since it uses as much as digits as its factorization.

99931031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 99931031 is about 9996.5509552045. The cubic root of 99931031 is about 464.0521502398.

The spelling of 99931031 in words is "ninety-nine million, nine hundred thirty-one thousand, thirty-one".