172872871 has 2 divisors, whose sum is σ = 172872872. Its totient is φ = 172872870.

The previous prime is 172872863. The next prime is 172872877. The reversal of 172872871 is 178278271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172872871 - 2³ = 172872863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172872877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86436435 + 86436436.

It is an arithmetic number, because the mean of its divisors is an integer number (86436436).

Almost surely, 2^172872871 is an apocalyptic number.

172872871 is a deficient number, since it is larger than the sum of its proper divisors (1).

172872871 is an equidigital number, since it uses as much as digits as its factorization.

172872871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87808, while the sum is 43.

The square root of 172872871 is about 13148.1128303647. The cubic root of 172872871 is about 557.0689446829.

The spelling of 172872871 in words is "one hundred seventy-two million, eight hundred seventy-two thousand, eight hundred seventy-one".