31744349881 has 4 divisors (see below), whose sum is σ = 31745973492. Its totient is φ = 31742726272.

The previous prime is 31744349873. The next prime is 31744349891. The reversal of 31744349881 is 18894344713.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18894344713 = 443 ⋅42650891.

It can be written as a sum of positive squares in 2 ways, for example, as 22183421481 + 9560928400 = 148941^2 + 97780^2 .

It is a cyclic number.

It is not a de Polignac number, because 31744349881 - 2³ = 31744349873 is a prime.

It is a super-2 number, since 2×31744349881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31744349801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782116 + ... + 821701.

It is an arithmetic number, because the mean of its divisors is an integer number (7936493373).

Almost surely, 2^31744349881 is an apocalyptic number.

It is an amenable number.

31744349881 is a deficient number, since it is larger than the sum of its proper divisors (1623611).

31744349881 is a wasteful number, since it uses less digits than its factorization.

31744349881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623610.

The product of its digits is 2322432, while the sum is 52.

The spelling of 31744349881 in words is "thirty-one billion, seven hundred forty-four million, three hundred forty-nine thousand, eight hundred eighty-one".