91761091 has 2 divisors, whose sum is σ = 91761092. Its totient is φ = 91761090.

The previous prime is 91761083. The next prime is 91761113. The reversal of 91761091 is 19016719.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91761091 - 2³ = 91761083 is a prime.

It is not a weakly prime, because it can be changed into another prime (91761031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45880545 + 45880546.

It is an arithmetic number, because the mean of its divisors is an integer number (45880546).

Almost surely, 2^91761091 is an apocalyptic number.

91761091 is a deficient number, since it is larger than the sum of its proper divisors (1).

91761091 is an equidigital number, since it uses as much as digits as its factorization.

91761091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 34.

The square root of 91761091 is about 9579.2009583263. The cubic root of 91761091 is about 451.0446364639.

The spelling of 91761091 in words is "ninety-one million, seven hundred sixty-one thousand, ninety-one".