3161861 has 4 divisors (see below), whose sum is σ = 3167724. Its totient is φ = 3156000.

The previous prime is 3161857. The next prime is 3161867. The reversal of 3161861 is 1681613.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2512225 + 649636 = 1585^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 3161861 - 2² = 3161857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3161861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3161867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2030 + ... + 3231.

It is an arithmetic number, because the mean of its divisors is an integer number (791931).

Almost surely, 2^3161861 is an apocalyptic number.

It is an amenable number.

3161861 is a deficient number, since it is larger than the sum of its proper divisors (5863).

3161861 is an equidigital number, since it uses as much as digits as its factorization.

3161861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5862.

The product of its digits is 864, while the sum is 26.

The square root of 3161861 is about 1778.1622535641. The cubic root of 3161861 is about 146.7734799284.

The spelling of 3161861 in words is "three million, one hundred sixty-one thousand, eight hundred sixty-one".