3161989 has 4 divisors (see below), whose sum is σ = 3166924. Its totient is φ = 3157056.

The previous prime is 3161953. The next prime is 3161993. The reversal of 3161989 is 9891613.

3161989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2505889 + 656100 = 1583^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 3161989 - 2¹³ = 3153797 is a prime.

It is a super-2 number, since 2×3161989² = 19996348872242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3161089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1332 + ... + 2845.

It is an arithmetic number, because the mean of its divisors is an integer number (791731).

Almost surely, 2^3161989 is an apocalyptic number.

It is an amenable number.

3161989 is a deficient number, since it is larger than the sum of its proper divisors (4935).

3161989 is an equidigital number, since it uses as much as digits as its factorization.

3161989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4934.

The product of its digits is 11664, while the sum is 37.

The square root of 3161989 is about 1778.1982454158. The cubic root of 3161989 is about 146.7754604869.

The spelling of 3161989 in words is "three million, one hundred sixty-one thousand, nine hundred eighty-nine".