2189691 has 12 divisors (see below), whose sum is σ = 3614832. Its totient is φ = 1251216.

The previous prime is 2189647. The next prime is 2189699. The reversal of 2189691 is 1969812.

2189691 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2189691 - 2⁷ = 2189563 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

2189691 is strictly pandigital in base 8.

It is not an unprimeable number, because it can be changed into a prime (2189699) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17316 + ... + 17441.

It is an arithmetic number, because the mean of its divisors is an integer number (301236).

2^2189691 is an apocalyptic number.

2189691 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2189691 is a deficient number, since it is larger than the sum of its proper divisors (1425141).

2189691 is a wasteful number, since it uses less digits than its factorization.

2189691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34770 (or 34767 counting only the distinct ones).

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

The square root of 2189691 is about 1479.7604535870. The cubic root of 2189691 is about 129.8556781020.

The spelling of 2189691 in words is "two million, one hundred eighty-nine thousand, six hundred ninety-one".