31279159221 has 4 divisors (see below), whose sum is σ = 41705545632. Its totient is φ = 20852772812.

The previous prime is 31279159193. The next prime is 31279159229. The reversal of 31279159221 is 12295197213.

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.

It is a cyclic number.

It is not a de Polignac number, because 31279159221 - 2¹⁵ = 31279126453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31279159229) 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, 5213193201 + ... + 5213193206.

It is an arithmetic number, because the mean of its divisors is an integer number (10426386408).

Almost surely, 2^31279159221 is an apocalyptic number.

It is an amenable number.

31279159221 is a deficient number, since it is larger than the sum of its proper divisors (10426386411).

31279159221 is a wasteful number, since it uses less digits than its factorization.

31279159221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10426386410.

The product of its digits is 68040, while the sum is 42.

The spelling of 31279159221 in words is "thirty-one billion, two hundred seventy-nine million, one hundred fifty-nine thousand, two hundred twenty-one".