31581361472 has 14 divisors (see below), whose sum is σ = 62669264298. Its totient is φ = 15790680704.

The previous prime is 31581361463. The next prime is 31581361523. The reversal of 31581361472 is 27416318513.

It can be written as a sum of positive squares in only one way, i.e., 29030707456 + 2550654016 = 170384^2 + 50504^2 .

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, 246729323 + ... + 246729450.

Almost surely, 2^31581361472 is an apocalyptic number.

31581361472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31581361472 is a deficient number, since it is larger than the sum of its proper divisors (31087902826).

31581361472 is an equidigital number, since it uses as much as digits as its factorization.

31581361472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493458785 (or 493458775 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

Adding to 31581361472 its reverse (27416318513), we get a palindrome (58997679985).

The spelling of 31581361472 in words is "thirty-one billion, five hundred eighty-one million, three hundred sixty-one thousand, four hundred seventy-two".