135642173 has 2 divisors, whose sum is σ = 135642174. Its totient is φ = 135642172.

The previous prime is 135642161. The next prime is 135642179. The reversal of 135642173 is 371246531.

135642173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98942809 + 36699364 = 9947^2 + 6058^2 .

It is a cyclic number.

It is not a de Polignac number, because 135642173 - 2²⁰ = 134593597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135642179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67821086 + 67821087.

It is an arithmetic number, because the mean of its divisors is an integer number (67821087).

Almost surely, 2^135642173 is an apocalyptic number.

It is an amenable number.

135642173 is a deficient number, since it is larger than the sum of its proper divisors (1).

135642173 is an equidigital number, since it uses as much as digits as its factorization.

135642173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 32.

The square root of 135642173 is about 11646.5519790194. The cubic root of 135642173 is about 513.8049053429.

The spelling of 135642173 in words is "one hundred thirty-five million, six hundred forty-two thousand, one hundred seventy-three".