172645223 has 2 divisors, whose sum is σ = 172645224. Its totient is φ = 172645222.

The previous prime is 172645211. The next prime is 172645243. The reversal of 172645223 is 322546271.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172645223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172645223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172645243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86322611 + 86322612.

It is an arithmetic number, because the mean of its divisors is an integer number (86322612).

Almost surely, 2^172645223 is an apocalyptic number.

172645223 is a deficient number, since it is larger than the sum of its proper divisors (1).

172645223 is an equidigital number, since it uses as much as digits as its factorization.

172645223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 32.

The square root of 172645223 is about 13139.4529185960. The cubic root of 172645223 is about 556.8243114698.

The spelling of 172645223 in words is "one hundred seventy-two million, six hundred forty-five thousand, two hundred twenty-three".