91820000231 has 2 divisors, whose sum is σ = 91820000232. Its totient is φ = 91820000230.

The previous prime is 91820000227. The next prime is 91820000257. The reversal of 91820000231 is 13200002819.

It is an a-pointer prime, because the next prime (91820000257) can be obtained adding 91820000231 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91820000231 - 2² = 91820000227 is a prime.

It is a super-2 number, since 2×91820000231² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91820000231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91820000281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45910000115 + 45910000116.

It is an arithmetic number, because the mean of its divisors is an integer number (45910000116).

Almost surely, 2^91820000231 is an apocalyptic number.

91820000231 is a deficient number, since it is larger than the sum of its proper divisors (1).

91820000231 is an equidigital number, since it uses as much as digits as its factorization.

91820000231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 91820000231 in words is "ninety-one billion, eight hundred twenty million, two hundred thirty-one", and thus it is an aban number.