31113361 has 4 divisors (see below), whose sum is σ = 31126324. Its totient is φ = 31100400.

The previous prime is 31113359. The next prime is 31113371. The reversal of 31113361 is 16331113.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16331113 = 1069 ⋅15277.

It can be written as a sum of positive squares in 2 ways, for example, as 7054336 + 24059025 = 2656^2 + 4905^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113361 - 2¹ = 31113359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31113311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1710 + ... + 8071.

It is an arithmetic number, because the mean of its divisors is an integer number (7781581).

Almost surely, 2^31113361 is an apocalyptic number.

It is an amenable number.

31113361 is a deficient number, since it is larger than the sum of its proper divisors (12963).

31113361 is an equidigital number, since it uses as much as digits as its factorization.

31113361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12962.

The product of its digits is 162, while the sum is 19.

The square root of 31113361 is about 5577.9351914485. The cubic root of 31113361 is about 314.5205134721.

Adding to 31113361 its reverse (16331113), we get a palindrome (47444474).

The spelling of 31113361 in words is "thirty-one million, one hundred thirteen thousand, three hundred sixty-one".