31323230993 has 2 divisors, whose sum is σ = 31323230994. Its totient is φ = 31323230992.

The previous prime is 31323230989. The next prime is 31323231031. The reversal of 31323230993 is 39903232313.

It is an a-pointer prime, because the next prime (31323231031) can be obtained adding 31323230993 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16034650384 + 15288580609 = 126628^2 + 123647^2 .

It is a cyclic number.

It is not a de Polignac number, because 31323230993 - 2² = 31323230989 is a prime.

It is a super-2 number, since 2×31323230993² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31323230693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661615496 + 15661615497.

It is an arithmetic number, because the mean of its divisors is an integer number (15661615497).

Almost surely, 2^31323230993 is an apocalyptic number.

It is an amenable number.

31323230993 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323230993 is an equidigital number, since it uses as much as digits as its factorization.

31323230993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 38.

The spelling of 31323230993 in words is "thirty-one billion, three hundred twenty-three million, two hundred thirty thousand, nine hundred ninety-three".