31418018 has 4 divisors (see below), whose sum is σ = 47127030. Its totient is φ = 15709008.

The previous prime is 31418017. The next prime is 31418021. The reversal of 31418018 is 81081413.

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

It can be written as a sum of positive squares in only one way, i.e., 28912129 + 2505889 = 5377^2 + 1583^2 .

It is not an unprimeable number, because it can be changed into a prime (31418017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7854503 + ... + 7854506.

Almost surely, 2^31418018 is an apocalyptic number.

31418018 is a deficient number, since it is larger than the sum of its proper divisors (15709012).

31418018 is a wasteful number, since it uses less digits than its factorization.

31418018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15709011.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 31418018 is about 5605.1777848700. The cubic root of 31418018 is about 315.5437588899.

The spelling of 31418018 in words is "thirty-one million, four hundred eighteen thousand, eighteen".