31631224164 has 12 divisors (see below), whose sum is σ = 73806189744. Its totient is φ = 10543741384.

The previous prime is 31631224151. The next prime is 31631224181. The reversal of 31631224164 is 46142213613.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×31631224164² (a number of 22 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1317967662 + ... + 1317967685.

It is an arithmetic number, because the mean of its divisors is an integer number (6150515812).

Almost surely, 2^31631224164 is an apocalyptic number.

It is an amenable number.

31631224164 is an abundant number, since it is smaller than the sum of its proper divisors (42174965580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31631224164 is a wasteful number, since it uses less digits than its factorization.

31631224164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635935354 (or 2635935352 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

Adding to 31631224164 its reverse (46142213613), we get a palindrome (77773437777).

The spelling of 31631224164 in words is "thirty-one billion, six hundred thirty-one million, two hundred twenty-four thousand, one hundred sixty-four".