91640601 has 24 divisors (see below), whose sum is σ = 146411720. Its totient is φ = 54867456.

The previous prime is 91640599. The next prime is 91640603. The reversal of 91640601 is 10604619.

91640601 is a `hidden beast` number, since 9 + 16 + 40 + 601 = 666.

It is an interprime number because it is at equal distance from previous prime (91640599) and next prime (91640603).

It can be written as a sum of positive squares in 4 ways, for example, as 41216400 + 50424201 = 6420^2 + 7101^2 .

It is not a de Polignac number, because 91640601 - 2¹ = 91640599 is a prime.

It is a super-3 number, since 3×91640601³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (91640603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6256 + ... + 14913.

Almost surely, 2^91640601 is an apocalyptic number.

It is an amenable number.

91640601 is a deficient number, since it is larger than the sum of its proper divisors (54771119).

91640601 is a wasteful number, since it uses less digits than its factorization.

91640601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21225 (or 21222 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 91640601 is about 9572.9097457356. The cubic root of 91640601 is about 450.8471301929.

The spelling of 91640601 in words is "ninety-one million, six hundred forty thousand, six hundred one".