31222945 has 16 divisors (see below), whose sum is σ = 41291712. Its totient is φ = 22518720.

The previous prime is 31222943. The next prime is 31222949. The reversal of 31222945 is 54922213.

It is not a de Polignac number, because 31222945 - 2¹ = 31222943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31222943) 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 in 15 ways as a sum of consecutive naturals, for example, 2791 + ... + 8380.

It is an arithmetic number, because the mean of its divisors is an integer number (2580732).

Almost surely, 2^31222945 is an apocalyptic number.

It is an amenable number.

31222945 is a deficient number, since it is larger than the sum of its proper divisors (10068767).

31222945 is a wasteful number, since it uses less digits than its factorization.

31222945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11232.

The product of its digits is 4320, while the sum is 28.

The square root of 31222945 is about 5587.7495470001. The cubic root of 31222945 is about 314.8893371248.

The spelling of 31222945 in words is "thirty-one million, two hundred twenty-two thousand, nine hundred forty-five".