618631 has 8 divisors (see below), whose sum is σ = 695520. Its totient is φ = 545952.

The previous prime is 618619. The next prime is 618637. The reversal of 618631 is 136816.

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

It is a cyclic number.

It is not a de Polignac number, because 618631 - 2⁹ = 618119 is a prime.

It is a super-2 number, since 2×618631² = 765408628322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 618596 and 618605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618637) 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, 736 + ... + 1333.

It is an arithmetic number, because the mean of its divisors is an integer number (86940).

2⁶¹⁸⁶³¹ is an apocalyptic number.

618631 is a deficient number, since it is larger than the sum of its proper divisors (76889).

618631 is a wasteful number, since it uses less digits than its factorization.

618631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105.

The product of its digits is 864, while the sum is 25.

The square root of 618631 is about 786.5309911250. The cubic root of 618631 is about 85.2073828894.

The spelling of 618631 in words is "six hundred eighteen thousand, six hundred thirty-one".