3172861 has 8 divisors (see below), whose sum is σ = 3372120. Its totient is φ = 2979648.

The previous prime is 3172847. The next prime is 3172879. The reversal of 3172861 is 1682713.

It can be written as a sum of positive squares in 4 ways, for example, as 632025 + 2540836 = 795^2 + 1594^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3172861 - 2⁷ = 3172733 is a prime.

3172861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3172801) 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 7 ways as a sum of consecutive naturals, for example, 406 + ... + 2551.

It is an arithmetic number, because the mean of its divisors is an integer number (421515).

Almost surely, 2^3172861 is an apocalyptic number.

It is an amenable number.

3172861 is a deficient number, since it is larger than the sum of its proper divisors (199259).

3172861 is a wasteful number, since it uses less digits than its factorization.

3172861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023.

The product of its digits is 2016, while the sum is 28.

The square root of 3172861 is about 1781.2526491208. The cubic root of 3172861 is about 146.9434894700.

The spelling of 3172861 in words is "three million, one hundred seventy-two thousand, eight hundred sixty-one".