99931261 has 2 divisors, whose sum is σ = 99931262. Its totient is φ = 99931260.

The previous prime is 99931231. The next prime is 99931313. The reversal of 99931261 is 16213999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98505625 + 1425636 = 9925^2 + 1194^2 .

It is a cyclic number.

It is not a de Polignac number, because 99931261 - 2¹⁵ = 99898493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99931231) 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, 49965630 + 49965631.

It is an arithmetic number, because the mean of its divisors is an integer number (49965631).

Almost surely, 2^99931261 is an apocalyptic number.

It is an amenable number.

99931261 is a deficient number, since it is larger than the sum of its proper divisors (1).

99931261 is an equidigital number, since it uses as much as digits as its factorization.

99931261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 40.

The square root of 99931261 is about 9996.5624591657. The cubic root of 99931261 is about 464.0525062584.

The spelling of 99931261 in words is "ninety-nine million, nine hundred thirty-one thousand, two hundred sixty-one".