91001959 has 2 divisors, whose sum is σ = 91001960. Its totient is φ = 91001958.

The previous prime is 91001941. The next prime is 91001993. The reversal of 91001959 is 95910019.

It is an a-pointer prime, because the next prime (91001993) can be obtained adding 91001959 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91001959 - 2⁵ = 91001927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91001059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500979 + 45500980.

It is an arithmetic number, because the mean of its divisors is an integer number (45500980).

Almost surely, 2^91001959 is an apocalyptic number.

91001959 is a deficient number, since it is larger than the sum of its proper divisors (1).

91001959 is an equidigital number, since it uses as much as digits as its factorization.

91001959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 91001959 is about 9539.4946931166. The cubic root of 91001959 is about 449.7973721481.

The spelling of 91001959 in words is "ninety-one million, one thousand, nine hundred fifty-nine".