31231310969 has 2 divisors, whose sum is σ = 31231310970. Its totient is φ = 31231310968.

The previous prime is 31231310959. The next prime is 31231311043. The reversal of 31231310969 is 96901313213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31229958400 + 1352569 = 176720^2 + 1163^2 .

It is an emirp because it is prime and its reverse (96901313213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31231310969 is a prime.

It is a super-2 number, since 2×31231310969² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31231310959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615655484 + 15615655485.

It is an arithmetic number, because the mean of its divisors is an integer number (15615655485).

Almost surely, 2^31231310969 is an apocalyptic number.

It is an amenable number.

31231310969 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231310969 is an equidigital number, since it uses as much as digits as its factorization.

31231310969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 38.

The spelling of 31231310969 in words is "thirty-one billion, two hundred thirty-one million, three hundred ten thousand, nine hundred sixty-nine".