2131989 has 4 divisors (see below), whose sum is σ = 2842656. Its totient is φ = 1421324.

The previous prime is 2131981. The next prime is 2131991. The reversal of 2131989 is 9891312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2131989 - 2³ = 2131981 is a prime.

It is a super-2 number, since 2×2131989² = 9090754192242, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131981) 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, 355329 + ... + 355334.

It is an arithmetic number, because the mean of its divisors is an integer number (710664).

2^2131989 is an apocalyptic number.

It is an amenable number.

2131989 is a deficient number, since it is larger than the sum of its proper divisors (710667).

2131989 is an equidigital number, since it uses as much as digits as its factorization.

2131989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710666.

The product of its digits is 3888, while the sum is 33.

The square root of 2131989 is about 1460.1332131008. The cubic root of 2131989 is about 128.7048718580.

The spelling of 2131989 in words is "two million, one hundred thirty-one thousand, nine hundred eighty-nine".