31798391819 has 4 divisors (see below), whose sum is σ = 31894459800. Its totient is φ = 31702323840.

The previous prime is 31798391803. The next prime is 31798391837. The reversal of 31798391819 is 91819389713.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31798391819 - 2⁴ = 31798391803 is a prime.

It is a super-2 number, since 2×31798391819² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31798391839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48033494 + ... + 48034155.

It is an arithmetic number, because the mean of its divisors is an integer number (7973614950).

Almost surely, 2^31798391819 is an apocalyptic number.

31798391819 is a deficient number, since it is larger than the sum of its proper divisors (96067981).

31798391819 is an equidigital number, since it uses as much as digits as its factorization.

31798391819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96067980.

The product of its digits is 2939328, while the sum is 59.

The spelling of 31798391819 in words is "thirty-one billion, seven hundred ninety-eight million, three hundred ninety-one thousand, eight hundred nineteen".