31816823998117 has 4 divisors (see below), whose sum is σ = 31949948784960. Its totient is φ = 31683699211276.

The previous prime is 31816823998103. The next prime is 31816823998207. The reversal of 31816823998117 is 71189932861813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31816823998117 - 2¹⁵ = 31816823965349 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 (31816823998517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66562393063 + ... + 66562393540.

It is an arithmetic number, because the mean of its divisors is an integer number (7987487196240).

Almost surely, 2^{31816823998117} is an apocalyptic number.

It is an amenable number.

31816823998117 is a deficient number, since it is larger than the sum of its proper divisors (133124786843).

31816823998117 is a wasteful number, since it uses less digits than its factorization.

31816823998117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133124786842.

The product of its digits is 31352832, while the sum is 67.

The spelling of 31816823998117 in words is "thirty-one trillion, eight hundred sixteen billion, eight hundred twenty-three million, nine hundred ninety-eight thousand, one hundred seventeen".