173366861 has 2 divisors, whose sum is σ = 173366862. Its totient is φ = 173366860.

The previous prime is 173366827. The next prime is 173366863. The reversal of 173366861 is 168663371.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114169225 + 59197636 = 10685^2 + 7694^2 .

It is a cyclic number.

It is not a de Polignac number, because 173366861 - 2²² = 169172557 is a prime.

Together with 173366863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173366863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86683430 + 86683431.

It is an arithmetic number, because the mean of its divisors is an integer number (86683431).

Almost surely, 2^173366861 is an apocalyptic number.

It is an amenable number.

173366861 is a deficient number, since it is larger than the sum of its proper divisors (1).

173366861 is an equidigital number, since it uses as much as digits as its factorization.

173366861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 173366861 is about 13166.8850150672. The cubic root of 173366861 is about 557.5990544365.

The spelling of 173366861 in words is "one hundred seventy-three million, three hundred sixty-six thousand, eight hundred sixty-one".