31816221441 has 24 divisors (see below), whose sum is σ = 43799872992. Its totient is φ = 20541984000.

The previous prime is 31816221433. The next prime is 31816221443. The reversal of 31816221441 is 14412261813.

It is not a de Polignac number, because 31816221441 - 2³ = 31816221433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31816221443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 667866 + ... + 713916.

It is an arithmetic number, because the mean of its divisors is an integer number (1824994708).

Almost surely, 2^31816221441 is an apocalyptic number.

It is an amenable number.

31816221441 is a deficient number, since it is larger than the sum of its proper divisors (11983651551).

31816221441 is a wasteful number, since it uses less digits than its factorization.

31816221441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46273 (or 46232 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The spelling of 31816221441 in words is "thirty-one billion, eight hundred sixteen million, two hundred twenty-one thousand, four hundred forty-one".