31371172823 has 2 divisors, whose sum is σ = 31371172824. Its totient is φ = 31371172822.

The previous prime is 31371172801. The next prime is 31371172867. The reversal of 31371172823 is 32827117313.

It is a weak prime.

It is an emirp because it is prime and its reverse (32827117313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31371172823 - 2¹² = 31371168727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31371172873) 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 as a sum of consecutive naturals, namely, 15685586411 + 15685586412.

It is an arithmetic number, because the mean of its divisors is an integer number (15685586412).

Almost surely, 2^31371172823 is an apocalyptic number.

31371172823 is a deficient number, since it is larger than the sum of its proper divisors (1).

31371172823 is an equidigital number, since it uses as much as digits as its factorization.

31371172823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 38.

The spelling of 31371172823 in words is "thirty-one billion, three hundred seventy-one million, one hundred seventy-two thousand, eight hundred twenty-three".