172281761 has 2 divisors, whose sum is σ = 172281762. Its totient is φ = 172281760.

The previous prime is 172281727. The next prime is 172281763. The reversal of 172281761 is 167182271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133841761 + 38440000 = 11569^2 + 6200^2 .

It is an emirp because it is prime and its reverse (167182271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172281761 - 2²² = 168087457 is a prime.

It is a super-2 number, since 2×172281761² = 59362010346522242, which contains 22 as substring.

Together with 172281763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172281763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86140880 + 86140881.

It is an arithmetic number, because the mean of its divisors is an integer number (86140881).

Almost surely, 2^172281761 is an apocalyptic number.

It is an amenable number.

172281761 is a deficient number, since it is larger than the sum of its proper divisors (1).

172281761 is an equidigital number, since it uses as much as digits as its factorization.

172281761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 35.

The square root of 172281761 is about 13125.6146903678. The cubic root of 172281761 is about 556.4332847846.

The spelling of 172281761 in words is "one hundred seventy-two million, two hundred eighty-one thousand, seven hundred sixty-one".