31443164 has 6 divisors (see below), whose sum is σ = 55025544. Its totient is φ = 15721580.

The previous prime is 31443143. The next prime is 31443169. The reversal of 31443164 is 46134413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31443169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3930392 + ... + 3930399.

It is an arithmetic number, because the mean of its divisors is an integer number (9170924).

Almost surely, 2^31443164 is an apocalyptic number.

It is an amenable number.

31443164 is a deficient number, since it is larger than the sum of its proper divisors (23582380).

31443164 is a wasteful number, since it uses less digits than its factorization.

31443164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7860795 (or 7860793 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 31443164 is about 5607.4204408088. The cubic root of 31443164 is about 315.6279202292.

Adding to 31443164 its reverse (46134413), we get a palindrome (77577577).

The spelling of 31443164 in words is "thirty-one million, four hundred forty-three thousand, one hundred sixty-four".