91945407 has 16 divisors (see below), whose sum is σ = 128291040. Its totient is φ = 58511232.

The previous prime is 91945397. The next prime is 91945409. The reversal of 91945407 is 70454919.

It is not a de Polignac number, because 91945407 - 2⁴ = 91945391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91945409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1932 + ... + 13697.

It is an arithmetic number, because the mean of its divisors is an integer number (8018190).

Almost surely, 2^91945407 is an apocalyptic number.

91945407 is a deficient number, since it is larger than the sum of its proper divisors (36345633).

91945407 is a wasteful number, since it uses less digits than its factorization.

91945407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15722.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 91945407 is about 9588.8167674641. The cubic root of 91945407 is about 451.3464315619.

The spelling of 91945407 in words is "ninety-one million, nine hundred forty-five thousand, four hundred seven".