17172561121 has 2 divisors, whose sum is σ = 17172561122. Its totient is φ = 17172561120.

The previous prime is 17172561097. The next prime is 17172561137. The reversal of 17172561121 is 12116527171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17171481600 + 1079521 = 131040^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 17172561121 - 2¹⁵ = 17172528353 is a prime.

It is not a weakly prime, because it can be changed into another prime (17172564121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8586280560 + 8586280561.

It is an arithmetic number, because the mean of its divisors is an integer number (8586280561).

Almost surely, 2^17172561121 is an apocalyptic number.

It is an amenable number.

17172561121 is a deficient number, since it is larger than the sum of its proper divisors (1).

17172561121 is an equidigital number, since it uses as much as digits as its factorization.

17172561121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 34.

The spelling of 17172561121 in words is "seventeen billion, one hundred seventy-two million, five hundred sixty-one thousand, one hundred twenty-one".