31131112 has 8 divisors (see below), whose sum is σ = 58370850. Its totient is φ = 15565552.

The previous prime is 31131091. The next prime is 31131119. The reversal of 31131112 is 21113113.

It can be written as a sum of positive squares in only one way, i.e., 29528356 + 1602756 = 5434^2 + 1266^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×31131112² = 1938292268713088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31131092 and 31131101.

It is not an unprimeable number, because it can be changed into a prime (31131119) by changing a digit.

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 as a sum of consecutive naturals, namely, 1945687 + ... + 1945702.

Almost surely, 2^31131112 is an apocalyptic number.

It is an amenable number.

31131112 is a deficient number, since it is larger than the sum of its proper divisors (27239738).

31131112 is a wasteful number, since it uses less digits than its factorization.

31131112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3891395 (or 3891391 counting only the distinct ones).

The product of its digits is 18, while the sum is 13.

The square root of 31131112 is about 5579.5261447546. The cubic root of 31131112 is about 314.5803162067.

Adding to 31131112 its reverse (21113113), we get a palindrome (52244225).

It can be divided in two parts, 3113111 and 2, that added together give a palindrome (3113113).

The spelling of 31131112 in words is "thirty-one million, one hundred thirty-one thousand, one hundred twelve".