2779261 has 2 divisors, whose sum is σ = 2779262. Its totient is φ = 2779260.

The previous prime is 2779253. The next prime is 2779277. The reversal of 2779261 is 1629772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2268036 + 511225 = 1506^2 + 715^2 .

It is a cyclic number.

It is not a de Polignac number, because 2779261 - 2³ = 2779253 is a prime.

It is a super-2 number, since 2×2779261² = 15448583412242, which contains 22 as substring.

2779261 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2779201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389630 + 1389631.

It is an arithmetic number, because the mean of its divisors is an integer number (1389631).

2^2779261 is an apocalyptic number.

It is an amenable number.

2779261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2779261 is an equidigital number, since it uses as much as digits as its factorization.

2779261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 34.

The square root of 2779261 is about 1667.1115739506. Note that the first 3 decimals coincide. The cubic root of 2779261 is about 140.5971263932.

The spelling of 2779261 in words is "two million, seven hundred seventy-nine thousand, two hundred sixty-one".