31443669 has 12 divisors (see below), whose sum is σ = 45625216. Its totient is φ = 20867112.

The previous prime is 31443661. The next prime is 31443721. The reversal of 31443669 is 96634413.

It is not a de Polignac number, because 31443669 - 2³ = 31443661 is a prime.

It is a super-2 number, since 2×31443669² = 1977408640363122, 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 (31443661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5827 + ... + 9840.

Almost surely, 2^31443669 is an apocalyptic number.

It is an amenable number.

31443669 is a deficient number, since it is larger than the sum of its proper divisors (14181547).

31443669 is a wasteful number, since it uses less digits than its factorization.

31443669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15896 (or 15893 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 31443669 is about 5607.4654702459. The cubic root of 31443669 is about 315.6296099578.

The spelling of 31443669 in words is "thirty-one million, four hundred forty-three thousand, six hundred sixty-nine".