172745219 has 2 divisors, whose sum is σ = 172745220. Its totient is φ = 172745218.

The previous prime is 172745197. The next prime is 172745269. The reversal of 172745219 is 912547271.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172745219 - 2⁸ = 172744963 is a prime.

It is a super-2 number, since 2×172745219² = 59681821374715922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172745269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86372609 + 86372610.

It is an arithmetic number, because the mean of its divisors is an integer number (86372610).

Almost surely, 2^172745219 is an apocalyptic number.

172745219 is a deficient number, since it is larger than the sum of its proper divisors (1).

172745219 is an equidigital number, since it uses as much as digits as its factorization.

172745219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 38.

The square root of 172745219 is about 13143.2575490249. The cubic root of 172745219 is about 556.9317948131.

The spelling of 172745219 in words is "one hundred seventy-two million, seven hundred forty-five thousand, two hundred nineteen".