31013018 has 8 divisors (see below), whose sum is σ = 46788948. Its totient is φ = 15416704.

The previous prime is 31012973. The next prime is 31013023. The reversal of 31013018 is 81031013.

It can be written as a sum of positive squares in 2 ways, for example, as 30946969 + 66049 = 5563^2 + 257^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31012987 and 31013005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44471 + ... + 45162.

Almost surely, 2^31013018 is an apocalyptic number.

31013018 is a deficient number, since it is larger than the sum of its proper divisors (15775930).

31013018 is a wasteful number, since it uses less digits than its factorization.

31013018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89808.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 31013018 is about 5568.9332910352. The cubic root of 31013018 is about 314.1820316588.

The spelling of 31013018 in words is "thirty-one million, thirteen thousand, eighteen".