1707172121 has 2 divisors, whose sum is σ = 1707172122. Its totient is φ = 1707172120.

The previous prime is 1707172091. The next prime is 1707172133. The reversal of 1707172121 is 1212717071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1675756096 + 31416025 = 40936^2 + 5605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1707172121 - 2⁶ = 1707172057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1707172141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 853586060 + 853586061.

It is an arithmetic number, because the mean of its divisors is an integer number (853586061).

Almost surely, 2^1707172121 is an apocalyptic number.

It is an amenable number.

1707172121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1707172121 is an equidigital number, since it uses as much as digits as its factorization.

1707172121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1372, while the sum is 29.

The square root of 1707172121 is about 41317.9394573350. The cubic root of 1707172121 is about 1195.1592304291.

Adding to 1707172121 its reverse (1212717071), we get a palindrome (2919889192).

The spelling of 1707172121 in words is "one billion, seven hundred seven million, one hundred seventy-two thousand, one hundred twenty-one".