31418665 has 12 divisors (see below), whose sum is σ = 38444364. Its totient is φ = 24649664.

The previous prime is 31418659. The next prime is 31418671. The reversal of 31418665 is 56681413.

31418665 = 3963² + 3964².

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31418659) and next prime (31418671).

It can be written as a sum of positive squares in 6 ways, for example, as 3031081 + 28387584 = 1741^2 + 5328^2 .

It is not a de Polignac number, because 31418665 - 2¹³ = 31410473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31418665.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12927 + ... + 15163.

It is an arithmetic number, because the mean of its divisors is an integer number (3203697).

Almost surely, 2^31418665 is an apocalyptic number.

31418665 is the 3964-th centered square number.

It is an amenable number.

31418665 is a deficient number, since it is larger than the sum of its proper divisors (7025699).

31418665 is an equidigital number, since it uses as much as digits as its factorization.

31418665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348 (or 2295 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 31418665 is about 5605.2354990669. The cubic root of 31418665 is about 315.5459249019.

The spelling of 31418665 in words is "thirty-one million, four hundred eighteen thousand, six hundred sixty-five".