31823021623 has 2 divisors, whose sum is σ = 31823021624. Its totient is φ = 31823021622.

The previous prime is 31823021621. The next prime is 31823021719. The reversal of 31823021623 is 32612032813.

It is a weak prime.

It is an emirp because it is prime and its reverse (32612032813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31823021623 - 2¹ = 31823021621 is a prime.

Together with 31823021621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31823021621) 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 as a sum of consecutive naturals, namely, 15911510811 + 15911510812.

It is an arithmetic number, because the mean of its divisors is an integer number (15911510812).

Almost surely, 2^31823021623 is an apocalyptic number.

31823021623 is a deficient number, since it is larger than the sum of its proper divisors (1).

31823021623 is an equidigital number, since it uses as much as digits as its factorization.

31823021623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 31823021623 in words is "thirty-one billion, eight hundred twenty-three million, twenty-one thousand, six hundred twenty-three".