90915091 has 2 divisors, whose sum is σ = 90915092. Its totient is φ = 90915090.

The previous prime is 90915079. The next prime is 90915101. The reversal of 90915091 is 19051909.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90915091 - 2⁵ = 90915059 is a prime.

It is not a weakly prime, because it can be changed into another prime (90915691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45457545 + 45457546.

It is an arithmetic number, because the mean of its divisors is an integer number (45457546).

Almost surely, 2^90915091 is an apocalyptic number.

90915091 is a deficient number, since it is larger than the sum of its proper divisors (1).

90915091 is an equidigital number, since it uses as much as digits as its factorization.

90915091 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 90915091 is about 9534.9405346861. The cubic root of 90915091 is about 449.6542051298.

The spelling of 90915091 in words is "ninety million, nine hundred fifteen thousand, ninety-one".