31220469 has 12 divisors (see below), whose sum is σ = 51538656. Its totient is φ = 17840232.

The previous prime is 31220447. The next prime is 31220507. The reversal of 31220469 is 96402213.

It is not a de Polignac number, because 31220469 - 2⁸ = 31220213 is a prime.

It is a super-2 number, since 2×31220469² = 1949435369159922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220419) 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, 247719 + ... + 247844.

It is an arithmetic number, because the mean of its divisors is an integer number (4294888).

Almost surely, 2^31220469 is an apocalyptic number.

It is an amenable number.

31220469 is a deficient number, since it is larger than the sum of its proper divisors (20318187).

31220469 is a wasteful number, since it uses less digits than its factorization.

31220469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495576 (or 495573 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 31220469 is about 5587.5279865071. The cubic root of 31220469 is about 314.8810132612.

The spelling of 31220469 in words is "thirty-one million, two hundred twenty thousand, four hundred sixty-nine".