31291323347 has 2 divisors, whose sum is σ = 31291323348. Its totient is φ = 31291323346.

The previous prime is 31291323313. The next prime is 31291323389. The reversal of 31291323347 is 74332319213.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31291323347 - 2¹² = 31291319251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31291323347.

It is not a weakly prime, because it can be changed into another prime (31291353347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15645661673 + 15645661674.

It is an arithmetic number, because the mean of its divisors is an integer number (15645661674).

Almost surely, 2^31291323347 is an apocalyptic number.

31291323347 is a deficient number, since it is larger than the sum of its proper divisors (1).

31291323347 is an equidigital number, since it uses as much as digits as its factorization.

31291323347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 38.

The spelling of 31291323347 in words is "thirty-one billion, two hundred ninety-one million, three hundred twenty-three thousand, three hundred forty-seven".