31222909 has 4 divisors (see below), whose sum is σ = 32866240. Its totient is φ = 29579580.

The previous prime is 31222907. The next prime is 31222913. The reversal of 31222909 is 90922213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31222909 - 2¹ = 31222907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821637 + ... + 821674.

It is an arithmetic number, because the mean of its divisors is an integer number (8216560).

Almost surely, 2^31222909 is an apocalyptic number.

It is an amenable number.

31222909 is a deficient number, since it is larger than the sum of its proper divisors (1643331).

31222909 is a wasteful number, since it uses less digits than its factorization.

31222909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643330.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 31222909 is about 5587.7463256665. The cubic root of 31222909 is about 314.8892161025.

It can be divided in two parts, 31222 and 909, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 31222909 in words is "thirty-one million, two hundred twenty-two thousand, nine hundred nine".