2821261 has 4 divisors (see below), whose sum is σ = 2836224. Its totient is φ = 2806300.

The previous prime is 2821229. The next prime is 2821267. The reversal of 2821261 is 1621282.

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 2821261 - 2⁵ = 2821229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821267) 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, 7195 + ... + 7576.

It is an arithmetic number, because the mean of its divisors is an integer number (709056).

2^2821261 is an apocalyptic number.

It is an amenable number.

2821261 is a deficient number, since it is larger than the sum of its proper divisors (14963).

2821261 is a wasteful number, since it uses less digits than its factorization.

2821261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14962.

The product of its digits is 384, while the sum is 22.

The square root of 2821261 is about 1679.6609776976. The cubic root of 2821261 is about 141.3018198152.

The spelling of 2821261 in words is "two million, eight hundred twenty-one thousand, two hundred sixty-one".