172869661 has 16 divisors (see below), whose sum is σ = 181254528. Its totient is φ = 164721600.

The previous prime is 172869659. The next prime is 172869673. The reversal of 172869661 is 166968271.

It is a cyclic number.

It is not a de Polignac number, because 172869661 - 2¹ = 172869659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172869601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 555696 + ... + 556006.

It is an arithmetic number, because the mean of its divisors is an integer number (11328408).

Almost surely, 2^172869661 is an apocalyptic number.

It is an amenable number.

172869661 is a deficient number, since it is larger than the sum of its proper divisors (8384867).

172869661 is a wasteful number, since it uses less digits than its factorization.

172869661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612.

The product of its digits is 217728, while the sum is 46.

The square root of 172869661 is about 13147.9907590476. The cubic root of 172869661 is about 557.0654966725.

The spelling of 172869661 in words is "one hundred seventy-two million, eight hundred sixty-nine thousand, six hundred sixty-one".