31018 has 8 divisors (see below), whose sum is σ = 50148. Its totient is φ = 14304.

The previous prime is 31013. The next prime is 31019. The reversal of 31018 is 81013.

It can be written as a sum of positive squares in 2 ways, for example, as 29929 + 1089 = 173^2 + 33^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 30989 and 31007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31013) 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, 571 + ... + 622.

2³¹⁰¹⁸ is an apocalyptic number.

31018 is a deficient number, since it is larger than the sum of its proper divisors (19130).

31018 is a wasteful number, since it uses less digits than its factorization.

31018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 31018 is about 176.1192777637. The cubic root of 31018 is about 31.4198854391.

The spelling of 31018 in words is "thirty-one thousand, eighteen".