31123519417 has 2 divisors, whose sum is σ = 31123519418. Its totient is φ = 31123519416.

The previous prime is 31123519397. The next prime is 31123519421. The reversal of 31123519417 is 71491532113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28597853881 + 2525665536 = 169109^2 + 50256^2 .

It is an emirp because it is prime and its reverse (71491532113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31123519417 - 2¹⁹ = 31122995129 is a prime.

It is not a weakly prime, because it can be changed into another prime (31123519457) 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, 15561759708 + 15561759709.

It is an arithmetic number, because the mean of its divisors is an integer number (15561759709).

Almost surely, 2^31123519417 is an apocalyptic number.

It is an amenable number.

31123519417 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123519417 is an equidigital number, since it uses as much as digits as its factorization.

31123519417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 37.

The spelling of 31123519417 in words is "thirty-one billion, one hundred twenty-three million, five hundred nineteen thousand, four hundred seventeen".