31121018 has 8 divisors (see below), whose sum is σ = 46768512. Its totient is φ = 15531516.

The previous prime is 31120997. The next prime is 31121021. The reversal of 31121018 is 81012113.

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

It is a super-2 number, since 2×31121018² = 1937035522712648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31120987 and 31121005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13130 + ... + 15317.

It is an arithmetic number, because the mean of its divisors is an integer number (5846064).

Almost surely, 2^31121018 is an apocalyptic number.

31121018 is a deficient number, since it is larger than the sum of its proper divisors (15647494).

31121018 is a wasteful number, since it uses less digits than its factorization.

31121018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28996.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 31121018 is about 5578.6215143170. The cubic root of 31121018 is about 314.5463125282.

The spelling of 31121018 in words is "thirty-one million, one hundred twenty-one thousand, eighteen".