31791216399 has 8 divisors (see below), whose sum is σ = 42451275312. Its totient is φ = 21162650880.

The previous prime is 31791216323. The next prime is 31791216427. The reversal of 31791216399 is 99361219713.

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

It is not a de Polignac number, because 31791216399 - 2¹² = 31791212303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31791216799) 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, 7870992 + ... + 7875029.

It is an arithmetic number, because the mean of its divisors is an integer number (5306409414).

Almost surely, 2^31791216399 is an apocalyptic number.

31791216399 is a deficient number, since it is larger than the sum of its proper divisors (10660058913).

31791216399 is a wasteful number, since it uses less digits than its factorization.

31791216399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15746697.

The product of its digits is 551124, while the sum is 51.

The spelling of 31791216399 in words is "thirty-one billion, seven hundred ninety-one million, two hundred sixteen thousand, three hundred ninety-nine".