31899662989 has 4 divisors (see below), whose sum is σ = 33578592640. Its totient is φ = 30220733340.

The previous prime is 31899662983. The next prime is 31899663011. The reversal of 31899662989 is 98926699813.

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: 98926699813 = 75277 ⋅1314169.

It is a cyclic number.

It is not a de Polignac number, because 31899662989 - 2³ = 31899662981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31899662981) 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, 839464797 + ... + 839464834.

It is an arithmetic number, because the mean of its divisors is an integer number (8394648160).

Almost surely, 2^31899662989 is an apocalyptic number.

It is an amenable number.

31899662989 is a deficient number, since it is larger than the sum of its proper divisors (1678929651).

31899662989 is a wasteful number, since it uses less digits than its factorization.

31899662989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678929650.

The product of its digits is 90699264, while the sum is 70.

The spelling of 31899662989 in words is "thirty-one billion, eight hundred ninety-nine million, six hundred sixty-two thousand, nine hundred eighty-nine".