31243012 has 6 divisors (see below), whose sum is σ = 54675278. Its totient is φ = 15621504.

The previous prime is 31243007. The next prime is 31243013. The reversal of 31243012 is 21034213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 23658496 + 7584516 = 4864^2 + 2754^2 .

It is a super-2 number, since 2×31243012² = 1952251597664288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31243013) 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, 3905373 + ... + 3905380.

Almost surely, 2^31243012 is an apocalyptic number.

It is an amenable number.

31243012 is a deficient number, since it is larger than the sum of its proper divisors (23432266).

31243012 is a wasteful number, since it uses less digits than its factorization.

31243012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7810757 (or 7810755 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31243012 is about 5589.5448830831. The cubic root of 31243012 is about 314.9567825147.

Adding to 31243012 its reverse (21034213), we get a palindrome (52277225).

The spelling of 31243012 in words is "thirty-one million, two hundred forty-three thousand, twelve".