91606641 has 32 divisors (see below), whose sum is σ = 143784960. Its totient is φ = 50791104.

The previous prime is 91606639. The next prime is 91606667. The reversal of 91606641 is 14660619.

It is not a de Polignac number, because 91606641 - 2¹ = 91606639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91606601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206566 + ... + 207008.

It is an arithmetic number, because the mean of its divisors is an integer number (4493280).

Almost surely, 2^91606641 is an apocalyptic number.

It is an amenable number.

91606641 is a deficient number, since it is larger than the sum of its proper divisors (52178319).

91606641 is a wasteful number, since it uses less digits than its factorization.

91606641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 91606641 is about 9571.1358260135. The cubic root of 91606641 is about 450.7914319542.

The spelling of 91606641 in words is "ninety-one million, six hundred six thousand, six hundred forty-one".