31140365 has 4 divisors (see below), whose sum is σ = 37368444. Its totient is φ = 24912288.

The previous prime is 31140349. The next prime is 31140391. The reversal of 31140365 is 56304113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56304113 = 59 ⋅954307.

It can be written as a sum of positive squares in 2 ways, for example, as 13942756 + 17197609 = 3734^2 + 4147^2 .

It is a cyclic number.

It is not a de Polignac number, because 31140365 - 2⁴ = 31140349 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 31140365.

It is a congruent number.

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, 3114032 + ... + 3114041.

It is an arithmetic number, because the mean of its divisors is an integer number (9342111).

Almost surely, 2^31140365 is an apocalyptic number.

It is an amenable number.

31140365 is a deficient number, since it is larger than the sum of its proper divisors (6228079).

31140365 is an equidigital number, since it uses as much as digits as its factorization.

31140365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6228078.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 31140365 is about 5580.3552754283. The cubic root of 31140365 is about 314.6114803502.

Adding to 31140365 its reverse (56304113), we get a palindrome (87444478).

The spelling of 31140365 in words is "thirty-one million, one hundred forty thousand, three hundred sixty-five".