31223042 has 32 divisors (see below), whose sum is σ = 51710400. Its totient is φ = 14084928.

The previous prime is 31223041. The next prime is 31223047. The reversal of 31223042 is 24032213.

It is a self number, because there is not a number n which added to its sum of digits gives 31223042.

It is not an unprimeable number, because it can be changed into a prime (31223041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74309 + ... + 74727.

It is an arithmetic number, because the mean of its divisors is an integer number (1615950).

Almost surely, 2^31223042 is an apocalyptic number.

31223042 is a deficient number, since it is larger than the sum of its proper divisors (20487358).

31223042 is a wasteful number, since it uses less digits than its factorization.

31223042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 31223042 is about 5587.7582266952. The cubic root of 31223042 is about 314.8896632123.

Adding to 31223042 its reverse (24032213), we get a palindrome (55255255).

The spelling of 31223042 in words is "thirty-one million, two hundred twenty-three thousand, forty-two".