90645197 has 4 divisors (see below), whose sum is σ = 90710940. Its totient is φ = 90579456.

The previous prime is 90645179. The next prime is 90645221. The reversal of 90645197 is 79154609.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44009956 + 46635241 = 6634^2 + 6829^2 .

It is a cyclic number.

It is not a de Polignac number, because 90645197 - 2⁶ = 90645133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90645397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30758 + ... + 33575.

It is an arithmetic number, because the mean of its divisors is an integer number (22677735).

Almost surely, 2^90645197 is an apocalyptic number.

It is an amenable number.

90645197 is a deficient number, since it is larger than the sum of its proper divisors (65743).

90645197 is a wasteful number, since it uses less digits than its factorization.

90645197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65742.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 90645197 is about 9520.7771216430. Note that the first 3 decimals coincide. The cubic root of 90645197 is about 449.2088105700.

The spelling of 90645197 in words is "ninety million, six hundred forty-five thousand, one hundred ninety-seven".