2166149 has 4 divisors (see below), whose sum is σ = 2173836. Its totient is φ = 2158464.

The previous prime is 2166137. The next prime is 2166161. The reversal of 2166149 is 9416612.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2166137) and next prime (2166161).

It can be written as a sum of positive squares in 2 ways, for example, as 1276900 + 889249 = 1130^2 + 943^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166149 - 2⁸ = 2165893 is a prime.

It is a Duffinian 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 (2166119) 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, 3404 + ... + 3989.

It is an arithmetic number, because the mean of its divisors is an integer number (543459).

2^2166149 is an apocalyptic number.

It is an amenable number.

2166149 is a deficient number, since it is larger than the sum of its proper divisors (7687).

2166149 is an equidigital number, since it uses as much as digits as its factorization.

2166149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7686.

The product of its digits is 2592, while the sum is 29.

The square root of 2166149 is about 1471.7842912601. The cubic root of 2166149 is about 129.3886283262.

The spelling of 2166149 in words is "two million, one hundred sixty-six thousand, one hundred forty-nine".