2681989 has 2 divisors, whose sum is σ = 2681990. Its totient is φ = 2681988.

The previous prime is 2681969. The next prime is 2681993. The reversal of 2681989 is 9891862.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1988100 + 693889 = 1410^2 + 833^2 .

It is a cyclic number.

It is not a de Polignac number, because 2681989 - 2⁹ = 2681477 is a prime.

It is a super-2 number, since 2×2681989² = 14386129992242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2681929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340994 + 1340995.

It is an arithmetic number, because the mean of its divisors is an integer number (1340995).

2^2681989 is an apocalyptic number.

It is an amenable number.

2681989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2681989 is an equidigital number, since it uses as much as digits as its factorization.

2681989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 43.

The square root of 2681989 is about 1637.6779292645. The cubic root of 2681989 is about 138.9373456046.

The spelling of 2681989 in words is "two million, six hundred eighty-one thousand, nine hundred eighty-nine".