617165491 has 2 divisors, whose sum is σ = 617165492. Its totient is φ = 617165490.

The previous prime is 617165489. The next prime is 617165561. The reversal of 617165491 is 194561716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 617165491 - 2¹ = 617165489 is a prime.

Together with 617165489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (617165401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308582745 + 308582746.

It is an arithmetic number, because the mean of its divisors is an integer number (308582746).

Almost surely, 2^617165491 is an apocalyptic number.

617165491 is a deficient number, since it is larger than the sum of its proper divisors (1).

617165491 is an equidigital number, since it uses as much as digits as its factorization.

617165491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 617165491 is about 24842.8156818023. The cubic root of 617165491 is about 851.4004553640.

The spelling of 617165491 in words is "six hundred seventeen million, one hundred sixty-five thousand, four hundred ninety-one".