31113444 has 24 divisors (see below), whose sum is σ = 72864288. Its totient is φ = 10333120.

The previous prime is 31113443. The next prime is 31113449. The reversal of 31113444 is 44431113.

It is a super-2 number, since 2×31113444² = 1936092795082272, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 31113444.

It is not an unprimeable number, because it can be changed into a prime (31113443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1242 + ... + 7985.

It is an arithmetic number, because the mean of its divisors is an integer number (3036012).

Almost surely, 2^31113444 is an apocalyptic number.

It is an amenable number.

31113444 is an abundant number, since it is smaller than the sum of its proper divisors (41750844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31113444 is a wasteful number, since it uses less digits than its factorization.

31113444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9515 (or 9513 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 31113444 is about 5577.9426314726. The cubic root of 31113444 is about 314.5207931502.

Adding to 31113444 its reverse (44431113), we get a palindrome (75544557).

It can be divided in two parts, 3111 and 3444, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 31113444 in words is "thirty-one million, one hundred thirteen thousand, four hundred forty-four".