91095581 has 2 divisors, whose sum is σ = 91095582. Its totient is φ = 91095580.

The previous prime is 91095553. The next prime is 91095601. The reversal of 91095581 is 18559019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74563225 + 16532356 = 8635^2 + 4066^2 .

It is a cyclic number.

It is not a de Polignac number, because 91095581 - 2¹⁸ = 90833437 is a prime.

It is a super-2 number, since 2×91095581² = 16596809755455122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91005581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45547790 + 45547791.

It is an arithmetic number, because the mean of its divisors is an integer number (45547791).

Almost surely, 2^91095581 is an apocalyptic number.

It is an amenable number.

91095581 is a deficient number, since it is larger than the sum of its proper divisors (1).

91095581 is an equidigital number, since it uses as much as digits as its factorization.

91095581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 91095581 is about 9544.4005050082. The cubic root of 91095581 is about 449.9515684503.

The spelling of 91095581 in words is "ninety-one million, ninety-five thousand, five hundred eighty-one".