172869887 has 2 divisors, whose sum is σ = 172869888. Its totient is φ = 172869886.

The previous prime is 172869871. The next prime is 172869937. The reversal of 172869887 is 788968271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172869887 - 2⁴ = 172869871 is a prime.

It is a super-3 number, since 3×172869887³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172869187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86434943 + 86434944.

It is an arithmetic number, because the mean of its divisors is an integer number (86434944).

Almost surely, 2^172869887 is an apocalyptic number.

172869887 is a deficient number, since it is larger than the sum of its proper divisors (1).

172869887 is an equidigital number, since it uses as much as digits as its factorization.

172869887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 56.

The square root of 172869887 is about 13147.9993535138. Note that the first 3 decimals coincide. The cubic root of 172869887 is about 557.0657394310.

The spelling of 172869887 in words is "one hundred seventy-two million, eight hundred sixty-nine thousand, eight hundred eighty-seven".