2791261 has 4 divisors (see below), whose sum is σ = 3045024. Its totient is φ = 2537500.

The previous prime is 2791253. The next prime is 2791267. The reversal of 2791261 is 1621972.

It is a happy number.

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 2791261 - 2³ = 2791253 is a prime.

It is a super-2 number, since 2×2791261² = 15582275940242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2791267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126865 + ... + 126886.

It is an arithmetic number, because the mean of its divisors is an integer number (761256).

2^2791261 is an apocalyptic number.

It is an amenable number.

2791261 is a deficient number, since it is larger than the sum of its proper divisors (253763).

2791261 is a wasteful number, since it uses less digits than its factorization.

2791261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253762.

The product of its digits is 1512, while the sum is 28.

The square root of 2791261 is about 1670.7067366836. The cubic root of 2791261 is about 140.7991876729.

It can be divided in two parts, 279 and 1261, that added together give a triangular number (1540 = T₅₅).

The spelling of 2791261 in words is "two million, seven hundred ninety-one thousand, two hundred sixty-one".