172447871 has 2 divisors, whose sum is σ = 172447872. Its totient is φ = 172447870.

The previous prime is 172447811. The next prime is 172447901. The reversal of 172447871 is 178744271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172447871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172447801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86223935 + 86223936.

It is an arithmetic number, because the mean of its divisors is an integer number (86223936).

Almost surely, 2^172447871 is an apocalyptic number.

172447871 is a deficient number, since it is larger than the sum of its proper divisors (1).

172447871 is an equidigital number, since it uses as much as digits as its factorization.

172447871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87808, while the sum is 41.

The square root of 172447871 is about 13131.9408694983. The cubic root of 172447871 is about 556.6120606115.

The spelling of 172447871 in words is "one hundred seventy-two million, four hundred forty-seven thousand, eight hundred seventy-one".