172644427 has 2 divisors, whose sum is σ = 172644428. Its totient is φ = 172644426.

The previous prime is 172644421. The next prime is 172644449. The reversal of 172644427 is 724446271.

It is a weak prime.

It is an emirp because it is prime and its reverse (724446271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172644427 - 2³ = 172644419 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172644421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86322213 + 86322214.

It is an arithmetic number, because the mean of its divisors is an integer number (86322214).

Almost surely, 2^172644427 is an apocalyptic number.

172644427 is a deficient number, since it is larger than the sum of its proper divisors (1).

172644427 is an equidigital number, since it uses as much as digits as its factorization.

172644427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 37.

The square root of 172644427 is about 13139.4226281066. The cubic root of 172644427 is about 556.8234557017.

The spelling of 172644427 in words is "one hundred seventy-two million, six hundred forty-four thousand, four hundred twenty-seven".