31891313999 has 8 divisors (see below), whose sum is σ = 33770351520. Its totient is φ = 30012618496.

The previous prime is 31891313983. The next prime is 31891314041. The reversal of 31891313999 is 99931319813.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31891313999 - 2⁴ = 31891313983 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 (31891313939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120707 + ... + 279915.

It is an arithmetic number, because the mean of its divisors is an integer number (4221293940).

Almost surely, 2^31891313999 is an apocalyptic number.

31891313999 is a deficient number, since it is larger than the sum of its proper divisors (1879037521).

31891313999 is a wasteful number, since it uses less digits than its factorization.

31891313999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171009.

The product of its digits is 1417176, while the sum is 56.

The spelling of 31891313999 in words is "thirty-one billion, eight hundred ninety-one million, three hundred thirteen thousand, nine hundred ninety-nine".