91375691 has 6 divisors (see below), whose sum is σ = 100437876. Its totient is φ = 83068700.

The previous prime is 91375679. The next prime is 91375699. The reversal of 91375691 is 19657319.

It is a de Polignac number, because none of the positive numbers 2^k-91375691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91375699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 377465 + ... + 377706.

It is an arithmetic number, because the mean of its divisors is an integer number (16739646).

Almost surely, 2^91375691 is an apocalyptic number.

91375691 is a deficient number, since it is larger than the sum of its proper divisors (9062185).

91375691 is a wasteful number, since it uses less digits than its factorization.

91375691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755193 (or 755182 counting only the distinct ones).

The product of its digits is 51030, while the sum is 41.

The square root of 91375691 is about 9559.0632909297. The cubic root of 91375691 is about 450.4122822411.

The spelling of 91375691 in words is "ninety-one million, three hundred seventy-five thousand, six hundred ninety-one".