617911561 has 8 divisors (see below), whose sum is σ = 640224000. Its totient is φ = 595747920.

The previous prime is 617911531. The next prime is 617911571. The reversal of 617911561 is 165119716.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-617911561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 617911561.

It is not an unprimeable number, because it can be changed into a prime (617911531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28711 + ... + 45388.

It is an arithmetic number, because the mean of its divisors is an integer number (80028000).

Almost surely, 2^617911561 is an apocalyptic number.

It is an amenable number.

617911561 is a deficient number, since it is larger than the sum of its proper divisors (22312439).

617911561 is a wasteful number, since it uses less digits than its factorization.

617911561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74399.

The product of its digits is 11340, while the sum is 37.

The square root of 617911561 is about 24857.8269565141. The cubic root of 617911561 is about 851.7433933927.

The spelling of 617911561 in words is "six hundred seventeen million, nine hundred eleven thousand, five hundred sixty-one".