91800099431 has 2 divisors, whose sum is σ = 91800099432. Its totient is φ = 91800099430.

The previous prime is 91800099427. The next prime is 91800099509. The reversal of 91800099431 is 13499000819.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91800099431 - 2² = 91800099427 is a prime.

It is a super-2 number, since 2×91800099431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91800099421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45900049715 + 45900049716.

It is an arithmetic number, because the mean of its divisors is an integer number (45900049716).

Almost surely, 2^91800099431 is an apocalyptic number.

91800099431 is a deficient number, since it is larger than the sum of its proper divisors (1).

91800099431 is an equidigital number, since it uses as much as digits as its factorization.

91800099431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 91800099431 in words is "ninety-one billion, eight hundred million, ninety-nine thousand, four hundred thirty-one".