2611989 has 12 divisors (see below), whose sum is σ = 3837600. Its totient is φ = 1711464.

The previous prime is 2611981. The next prime is 2611991. The reversal of 2611989 is 9891162.

It is not a de Polignac number, because 2611989 - 2³ = 2611981 is a prime.

It is a super-2 number, since 2×2611989² = 13644973072242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2611981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1929 + ... + 2990.

It is an arithmetic number, because the mean of its divisors is an integer number (319800).

2^2611989 is an apocalyptic number.

It is an amenable number.

2611989 is a deficient number, since it is larger than the sum of its proper divisors (1225611).

2611989 is a wasteful number, since it uses less digits than its factorization.

2611989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4984 (or 4981 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 2611989 is about 1616.1649049525. The cubic root of 2611989 is about 137.7179178099.

It can be divided in two parts, 2611 and 989, that added together give a square (3600 = 60²).

The spelling of 2611989 in words is "two million, six hundred eleven thousand, nine hundred eighty-nine".