17431394857 has 2 divisors, whose sum is σ = 17431394858. Its totient is φ = 17431394856.

The previous prime is 17431394837. The next prime is 17431394861. The reversal of 17431394857 is 75849313471.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10408284441 + 7023110416 = 102021^2 + 83804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17431394857 is a prime.

It is not a weakly prime, because it can be changed into another prime (17431394837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8715697428 + 8715697429.

It is an arithmetic number, because the mean of its divisors is an integer number (8715697429).

Almost surely, 2^17431394857 is an apocalyptic number.

It is an amenable number.

17431394857 is a deficient number, since it is larger than the sum of its proper divisors (1).

17431394857 is an equidigital number, since it uses as much as digits as its factorization.

17431394857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 52.

The spelling of 17431394857 in words is "seventeen billion, four hundred thirty-one million, three hundred ninety-four thousand, eight hundred fifty-seven".