31711883989 has 4 divisors (see below), whose sum is σ = 32805397260. Its totient is φ = 30618370720.

The previous prime is 31711883971. The next prime is 31711884019. The reversal of 31711883989 is 98938811713.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22150368900 + 9561515089 = 148830^2 + 97783^2 .

It is a cyclic number.

It is not a de Polignac number, because 31711883989 - 2⁹ = 31711883477 is a prime.

It is a super-2 number, since 2×31711883989² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31711883689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546756592 + ... + 546756649.

It is an arithmetic number, because the mean of its divisors is an integer number (8201349315).

Almost surely, 2^31711883989 is an apocalyptic number.

It is an amenable number.

31711883989 is a deficient number, since it is larger than the sum of its proper divisors (1093513271).

31711883989 is a wasteful number, since it uses less digits than its factorization.

31711883989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093513270.

The product of its digits is 2612736, while the sum is 58.

The spelling of 31711883989 in words is "thirty-one billion, seven hundred eleven million, eight hundred eighty-three thousand, nine hundred eighty-nine".