31231772216 has 8 divisors (see below), whose sum is σ = 58559572920. Its totient is φ = 15615886104.

The previous prime is 31231772203. The next prime is 31231772237. The reversal of 31231772216 is 61227713213.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1951985756 + ... + 1951985771.

It is an arithmetic number, because the mean of its divisors is an integer number (7319946615).

Almost surely, 2^31231772216 is an apocalyptic number.

It is an amenable number.

31231772216 is a deficient number, since it is larger than the sum of its proper divisors (27327800704).

31231772216 is a wasteful number, since it uses less digits than its factorization.

31231772216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903971533 (or 3903971529 counting only the distinct ones).

The product of its digits is 21168, while the sum is 35.

The spelling of 31231772216 in words is "thirty-one billion, two hundred thirty-one million, seven hundred seventy-two thousand, two hundred sixteen".