31985469 has 16 divisors (see below), whose sum is σ = 47632000. Its totient is φ = 21212928.

The previous prime is 31985431. The next prime is 31985477. The reversal of 31985469 is 96458913.

It is a happy number.

It is not a de Polignac number, because 31985469 - 2¹¹ = 31983421 is a prime.

It is a super-2 number, since 2×31985469² = 2046140454299922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31985489) 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, 2397 + ... + 8349.

It is an arithmetic number, because the mean of its divisors is an integer number (2977000).

Almost surely, 2^31985469 is an apocalyptic number.

It is an amenable number.

31985469 is a deficient number, since it is larger than the sum of its proper divisors (15646531).

31985469 is a wasteful number, since it uses less digits than its factorization.

31985469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6161 (or 6155 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 31985469 is about 5655.5697325734. The cubic root of 31985469 is about 317.4321478582.

The spelling of 31985469 in words is "thirty-one million, nine hundred eighty-five thousand, four hundred sixty-nine".