31871602889 has 4 divisors (see below), whose sum is σ = 36424689024. Its totient is φ = 27318516756.

The previous prime is 31871602859. The next prime is 31871602891. The reversal of 31871602889 is 98820617813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98820617813 = 4517 ⋅21877489.

It is a cyclic number.

It is not a de Polignac number, because 31871602889 - 2¹⁶ = 31871537353 is a prime.

It is a super-2 number, since 2×31871602889² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31871602889.

It is not an unprimeable number, because it can be changed into a prime (31871602859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2276543057 + ... + 2276543070.

It is an arithmetic number, because the mean of its divisors is an integer number (9106172256).

Almost surely, 2^31871602889 is an apocalyptic number.

It is an amenable number.

31871602889 is a deficient number, since it is larger than the sum of its proper divisors (4553086135).

31871602889 is an equidigital number, since it uses as much as digits as its factorization.

31871602889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4553086134.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The spelling of 31871602889 in words is "thirty-one billion, eight hundred seventy-one million, six hundred two thousand, eight hundred eighty-nine".