31581672442 has 16 divisors (see below), whose sum is σ = 47494572840. Its totient is φ = 15750194688.

The previous prime is 31581672431. The next prime is 31581672467. The reversal of 31581672442 is 24427618513.

It can be written as a sum of positive squares in 4 ways, for example, as 31131426481 + 450245961 = 176441^2 + 21219^2 .

It is a super-3 number, since 3×31581672442³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1465288 + ... + 1486684.

Almost surely, 2^31581672442 is an apocalyptic number.

31581672442 is a deficient number, since it is larger than the sum of its proper divisors (15912900398).

31581672442 is a wasteful number, since it uses less digits than its factorization.

31581672442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23265.

The product of its digits is 322560, while the sum is 43.

The spelling of 31581672442 in words is "thirty-one billion, five hundred eighty-one million, six hundred seventy-two thousand, four hundred forty-two".