31606363889 has 4 divisors (see below), whose sum is σ = 31855233024. Its totient is φ = 31357494756.

The previous prime is 31606363883. The next prime is 31606363913. The reversal of 31606363889 is 98836360613.

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: 98836360613 = 1237 ⋅79900049.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31606363889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31606363889.

It is not an unprimeable number, because it can be changed into a prime (31606363883) 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, 124434377 + ... + 124434630.

It is an arithmetic number, because the mean of its divisors is an integer number (7963808256).

Almost surely, 2^31606363889 is an apocalyptic number.

It is an amenable number.

31606363889 is a deficient number, since it is larger than the sum of its proper divisors (248869135).

31606363889 is a wasteful number, since it uses less digits than its factorization.

31606363889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248869134.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The spelling of 31606363889 in words is "thirty-one billion, six hundred six million, three hundred sixty-three thousand, eight hundred eighty-nine".