31312242 has 24 divisors (see below), whose sum is σ = 73062444. Its totient is φ = 9634464.

The previous prime is 31312219. The next prime is 31312243. The reversal of 31312242 is 24221313.

It can be written as a sum of positive squares in 2 ways, for example, as 24295041 + 7017201 = 4929^2 + 2649^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31312243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66673 + ... + 67140.

Almost surely, 2^31312242 is an apocalyptic number.

31312242 is an abundant number, since it is smaller than the sum of its proper divisors (41750202).

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

31312242 is a wasteful number, since it uses less digits than its factorization.

31312242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133834 (or 133831 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 31312242 is about 5595.7342681725. The cubic root of 31312242 is about 315.1892438053.

Adding to 31312242 its reverse (24221313), we get a palindrome (55533555).

The spelling of 31312242 in words is "thirty-one million, three hundred twelve thousand, two hundred forty-two".