90645191 has 16 divisors (see below), whose sum is σ = 111788544. Its totient is φ = 71574624.

The previous prime is 90645179. The next prime is 90645221. The reversal of 90645191 is 19154609.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90645191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90645151) 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, 80156 + ... + 81278.

It is an arithmetic number, because the mean of its divisors is an integer number (6986784).

Almost surely, 2^90645191 is an apocalyptic number.

90645191 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

90645191 is a deficient number, since it is larger than the sum of its proper divisors (21143353).

90645191 is a wasteful number, since it uses less digits than its factorization.

90645191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 90645191 is about 9520.7768065426. The cubic root of 90645191 is about 449.2088006587.

The spelling of 90645191 in words is "ninety million, six hundred forty-five thousand, one hundred ninety-one".