91309707 has 8 divisors (see below), whose sum is σ = 135273680. Its totient is φ = 60873120.

The previous prime is 91309693. The next prime is 91309717. The reversal of 91309707 is 70790319.

It is not a de Polignac number, because 91309707 - 2¹¹ = 91307659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91309717) 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 in 7 ways as a sum of consecutive naturals, for example, 1690894 + ... + 1690947.

It is an arithmetic number, because the mean of its divisors is an integer number (16909210).

Almost surely, 2^91309707 is an apocalyptic number.

91309707 is a deficient number, since it is larger than the sum of its proper divisors (43963973).

91309707 is a wasteful number, since it uses less digits than its factorization.

91309707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3381850 (or 3381844 counting only the distinct ones).

The product of its (nonzero) digits is 11907, while the sum is 36.

The square root of 91309707 is about 9555.6112834292. The cubic root of 91309707 is about 450.3038392465.

The spelling of 91309707 in words is "ninety-one million, three hundred nine thousand, seven hundred seven".