173661157 has 2 divisors, whose sum is σ = 173661158. Its totient is φ = 173661156.

The previous prime is 173661151. The next prime is 173661167. The reversal of 173661157 is 751166371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143256961 + 30404196 = 11969^2 + 5514^2 .

It is a cyclic number.

It is not a de Polignac number, because 173661157 - 2⁷ = 173661029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173661151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86830578 + 86830579.

It is an arithmetic number, because the mean of its divisors is an integer number (86830579).

Almost surely, 2^173661157 is an apocalyptic number.

It is an amenable number.

173661157 is a deficient number, since it is larger than the sum of its proper divisors (1).

173661157 is an equidigital number, since it uses as much as digits as its factorization.

173661157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 37.

The square root of 173661157 is about 13178.0558884837. The cubic root of 173661157 is about 557.9143903725.

The spelling of 173661157 in words is "one hundred seventy-three million, six hundred sixty-one thousand, one hundred fifty-seven".