617890197 has 4 divisors (see below), whose sum is σ = 823853600. Its totient is φ = 411926796.

The previous prime is 617890151. The next prime is 617890219. The reversal of 617890197 is 791098716.

It is a happy number.

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 not a de Polignac number, because 617890197 - 2⁷ = 617890069 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 (617890397) 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, 102981697 + ... + 102981702.

It is an arithmetic number, because the mean of its divisors is an integer number (205963400).

Almost surely, 2^617890197 is an apocalyptic number.

It is an amenable number.

617890197 is a deficient number, since it is larger than the sum of its proper divisors (205963403).

617890197 is a wasteful number, since it uses less digits than its factorization.

617890197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205963402.

The product of its (nonzero) digits is 190512, while the sum is 48.

The square root of 617890197 is about 24857.3972289940. The cubic root of 617890197 is about 851.7335770713.

The spelling of 617890197 in words is "six hundred seventeen million, eight hundred ninety thousand, one hundred ninety-seven".