617881 has 4 divisors (see below), whose sum is σ = 674064. Its totient is φ = 561700.

The previous prime is 617879. The next prime is 617887. The reversal of 617881 is 188716.

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 a cyclic number.

It is not a de Polignac number, because 617881 - 2¹ = 617879 is a prime.

It is a super-2 number, since 2×617881² = 763553860322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (617887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28075 + ... + 28096.

It is an arithmetic number, because the mean of its divisors is an integer number (168516).

2⁶¹⁷⁸⁸¹ is an apocalyptic number.

It is an amenable number.

617881 is a deficient number, since it is larger than the sum of its proper divisors (56183).

617881 is a wasteful number, since it uses less digits than its factorization.

617881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56182.

The product of its digits is 2688, while the sum is 31.

The square root of 617881 is about 786.0540693871. The cubic root of 617881 is about 85.1729351168.

The spelling of 617881 in words is "six hundred seventeen thousand, eight hundred eighty-one".