172668571 has 2 divisors, whose sum is σ = 172668572. Its totient is φ = 172668570.

The previous prime is 172668533. The next prime is 172668577. The reversal of 172668571 is 175866271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172668571 - 2¹¹ = 172666523 is a prime.

It is a super-2 number, since 2×172668571² = 59628870822364082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172668577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86334285 + 86334286.

It is an arithmetic number, because the mean of its divisors is an integer number (86334286).

Almost surely, 2^172668571 is an apocalyptic number.

172668571 is a deficient number, since it is larger than the sum of its proper divisors (1).

172668571 is an equidigital number, since it uses as much as digits as its factorization.

172668571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 172668571 is about 13140.3413578187. The cubic root of 172668571 is about 556.8494113978.

The spelling of 172668571 in words is "one hundred seventy-two million, six hundred sixty-eight thousand, five hundred seventy-one".