31121013347 has 2 divisors, whose sum is σ = 31121013348. Its totient is φ = 31121013346.

The previous prime is 31121013241. The next prime is 31121013359. The reversal of 31121013347 is 74331012113.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (74331012113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31121013347 is a prime.

It is not a weakly prime, because it can be changed into another prime (31121015347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560506673 + 15560506674.

It is an arithmetic number, because the mean of its divisors is an integer number (15560506674).

Almost surely, 2^31121013347 is an apocalyptic number.

31121013347 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121013347 is an equidigital number, since it uses as much as digits as its factorization.

31121013347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The spelling of 31121013347 in words is "thirty-one billion, one hundred twenty-one million, thirteen thousand, three hundred forty-seven".