2921281 has 4 divisors (see below), whose sum is σ = 3186864. Its totient is φ = 2655700.

The previous prime is 2921273. The next prime is 2921293. The reversal of 2921281 is 1821292.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2921281 - 2³ = 2921273 is a prime.

It is a super-2 number, since 2×2921281² = 17067765361922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2921221) 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, 132775 + ... + 132796.

It is an arithmetic number, because the mean of its divisors is an integer number (796716).

2^2921281 is an apocalyptic number.

It is an amenable number.

2921281 is a deficient number, since it is larger than the sum of its proper divisors (265583).

2921281 is a wasteful number, since it uses less digits than its factorization.

2921281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265582.

The product of its digits is 576, while the sum is 25.

The square root of 2921281 is about 1709.1755322377. The cubic root of 2921281 is about 142.9522881889.

The spelling of 2921281 in words is "two million, nine hundred twenty-one thousand, two hundred eighty-one".