197090657 has 4 divisors (see below), whose sum is σ = 205659840. Its totient is φ = 188521476.

The previous prime is 197090627. The next prime is 197090687. The reversal of 197090657 is 756090791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (197090627) and next prime (197090687).

It is a cyclic number.

It is not a de Polignac number, because 197090657 - 2²⁰ = 196042081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197090627) 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, 4284557 + ... + 4284602.

It is an arithmetic number, because the mean of its divisors is an integer number (51414960).

Almost surely, 2^197090657 is an apocalyptic number.

It is an amenable number.

197090657 is a deficient number, since it is larger than the sum of its proper divisors (8569183).

197090657 is an equidigital number, since it uses as much as digits as its factorization.

197090657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8569182.

The product of its (nonzero) digits is 119070, while the sum is 44.

The square root of 197090657 is about 14038.8979980624. The cubic root of 197090657 is about 581.9540287571.

The spelling of 197090657 in words is "one hundred ninety-seven million, ninety thousand, six hundred fifty-seven".