91015091 has 2 divisors, whose sum is σ = 91015092. Its totient is φ = 91015090.

The previous prime is 91015069. The next prime is 91015147. The reversal of 91015091 is 19051019.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91015091 - 2⁶ = 91015027 is a prime.

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 91015091.

It is not a weakly prime, because it can be changed into another prime (91015051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45507545 + 45507546.

It is an arithmetic number, because the mean of its divisors is an integer number (45507546).

Almost surely, 2^91015091 is an apocalyptic number.

91015091 is a deficient number, since it is larger than the sum of its proper divisors (1).

91015091 is an equidigital number, since it uses as much as digits as its factorization.

91015091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 405, while the sum is 26.

The square root of 91015091 is about 9540.1829647025. The cubic root of 91015091 is about 449.8190070486.

The spelling of 91015091 in words is "ninety-one million, fifteen thousand, ninety-one".