2609989 has 2 divisors, whose sum is σ = 2609990. Its totient is φ = 2609988.

The previous prime is 2609963. The next prime is 2610059. The reversal of 2609989 is 9899062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2608225 + 1764 = 1615^2 + 42^2 .

It is a cyclic number.

It is not a de Polignac number, because 2609989 - 2¹⁵ = 2577221 is a prime.

It is a super-3 number, since 3×2609989³ = 53338068604942286007, which contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2609489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1304994 + 1304995.

It is an arithmetic number, because the mean of its divisors is an integer number (1304995).

2^2609989 is an apocalyptic number.

It is an amenable number.

2609989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2609989 is an equidigital number, since it uses as much as digits as its factorization.

2609989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 2609989 is about 1615.5460377222. The cubic root of 2609989 is about 137.6827586310.

The spelling of 2609989 in words is "two million, six hundred nine thousand, nine hundred eighty-nine".