2149771 has 4 divisors (see below), whose sum is σ = 2315152. Its totient is φ = 1984392.

The previous prime is 2149727. The next prime is 2149781. The reversal of 2149771 is 1779412.

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

It is a cyclic number.

It is not a de Polignac number, because 2149771 - 2¹⁹ = 1625483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2149711) 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, 82671 + ... + 82696.

It is an arithmetic number, because the mean of its divisors is an integer number (578788).

2^2149771 is an apocalyptic number.

2149771 is a deficient number, since it is larger than the sum of its proper divisors (165381).

2149771 is a wasteful number, since it uses less digits than its factorization.

2149771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165380.

The product of its digits is 3528, while the sum is 31.

The square root of 2149771 is about 1466.2097394302. The cubic root of 2149771 is about 129.0617055512.

The spelling of 2149771 in words is "two million, one hundred forty-nine thousand, seven hundred seventy-one".