3131661 has 16 divisors (see below), whose sum is σ = 4576320. Its totient is φ = 1893120.

The previous prime is 3131641. The next prime is 3131669. The reversal of 3131661 is 1661313.

It is not a de Polignac number, because 3131661 - 2⁵ = 3131629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1621 + ... + 2981.

It is an arithmetic number, because the mean of its divisors is an integer number (286020).

Almost surely, 2^3131661 is an apocalyptic number.

It is an amenable number.

3131661 is a deficient number, since it is larger than the sum of its proper divisors (1444659).

3131661 is a wasteful number, since it uses less digits than its factorization.

3131661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436.

The product of its digits is 324, while the sum is 21.

The square root of 3131661 is about 1769.6499653886. The cubic root of 3131661 is about 146.3046898976.

Adding to 3131661 its reverse (1661313), we get a palindrome (4792974).

The spelling of 3131661 in words is "three million, one hundred thirty-one thousand, six hundred sixty-one".