91605967 has 2 divisors, whose sum is σ = 91605968. Its totient is φ = 91605966.

The previous prime is 91605959. The next prime is 91605977. The reversal of 91605967 is 76950619.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91605967 - 2³ = 91605959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91605977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45802983 + 45802984.

It is an arithmetic number, because the mean of its divisors is an integer number (45802984).

Almost surely, 2^91605967 is an apocalyptic number.

91605967 is a deficient number, since it is larger than the sum of its proper divisors (1).

91605967 is an equidigital number, since it uses as much as digits as its factorization.

91605967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 91605967 is about 9571.1006159166. The cubic root of 91605967 is about 450.7903263787.

The spelling of 91605967 in words is "ninety-one million, six hundred five thousand, nine hundred sixty-seven".