618791 has 4 divisors (see below), whose sum is σ = 638784. Its totient is φ = 598800.

The previous prime is 618719. The next prime is 618799. The reversal of 618791 is 197816.

618791 = 126² + 127² + ... + 156².

618791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 618791 - 2¹⁰ = 617767 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 (618799) 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, 9950 + ... + 10011.

It is an arithmetic number, because the mean of its divisors is an integer number (159696).

2⁶¹⁸⁷⁹¹ is an apocalyptic number.

618791 is a deficient number, since it is larger than the sum of its proper divisors (19993).

618791 is a wasteful number, since it uses less digits than its factorization.

618791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19992.

The product of its digits is 3024, while the sum is 32.

The square root of 618791 is about 786.6326970067. The cubic root of 618791 is about 85.2147281437.

The spelling of 618791 in words is "six hundred eighteen thousand, seven hundred ninety-one".