172765261 has 2 divisors, whose sum is σ = 172765262. Its totient is φ = 172765260.

The previous prime is 172765217. The next prime is 172765283. The reversal of 172765261 is 162567271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112996900 + 59768361 = 10630^2 + 7731^2 .

It is a cyclic number.

It is not a de Polignac number, because 172765261 - 2⁷ = 172765133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172765261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172765211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86382630 + 86382631.

It is an arithmetic number, because the mean of its divisors is an integer number (86382631).

Almost surely, 2^172765261 is an apocalyptic number.

It is an amenable number.

172765261 is a deficient number, since it is larger than the sum of its proper divisors (1).

172765261 is an equidigital number, since it uses as much as digits as its factorization.

172765261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 37.

The square root of 172765261 is about 13144.0199710743. The cubic root of 172765261 is about 556.9533324963.

The spelling of 172765261 in words is "one hundred seventy-two million, seven hundred sixty-five thousand, two hundred sixty-one".