17131931081 has 2 divisors, whose sum is σ = 17131931082. Its totient is φ = 17131931080.

The previous prime is 17131931029. The next prime is 17131931111. The reversal of 17131931081 is 18013913171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16392961225 + 738969856 = 128035^2 + 27184^2 .

It is an emirp because it is prime and its reverse (18013913171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17131931081 - 2²⁶ = 17064822217 is a prime.

It is a super-2 number, since 2×17131931081² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (17131931281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8565965540 + 8565965541.

It is an arithmetic number, because the mean of its divisors is an integer number (8565965541).

Almost surely, 2^17131931081 is an apocalyptic number.

It is an amenable number.

17131931081 is a deficient number, since it is larger than the sum of its proper divisors (1).

17131931081 is an equidigital number, since it uses as much as digits as its factorization.

17131931081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 35.

The spelling of 17131931081 in words is "seventeen billion, one hundred thirty-one million, nine hundred thirty-one thousand, eighty-one".