31213268 has 6 divisors (see below), whose sum is σ = 54623226. Its totient is φ = 15606632.

The previous prime is 31213261. The next prime is 31213289. The reversal of 31213268 is 86231213.

It can be written as a sum of positive squares in only one way, i.e., 30780304 + 432964 = 5548^2 + 658^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213261) 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, 3901655 + ... + 3901662.

It is an arithmetic number, because the mean of its divisors is an integer number (9103871).

Almost surely, 2^31213268 is an apocalyptic number.

It is an amenable number.

31213268 is a deficient number, since it is larger than the sum of its proper divisors (23409958).

31213268 is a wasteful number, since it uses less digits than its factorization.

31213268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7803321 (or 7803319 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 31213268 is about 5586.8835677862. The cubic root of 31213268 is about 314.8568023017.

The spelling of 31213268 in words is "thirty-one million, two hundred thirteen thousand, two hundred sixty-eight".