2757221 has 2 divisors, whose sum is σ = 2757222. Its totient is φ = 2757220.

The previous prime is 2757211. The next prime is 2757229. The reversal of 2757221 is 1227572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2608225 + 148996 = 1615^2 + 386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2757221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2757229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1378610 + 1378611.

It is an arithmetic number, because the mean of its divisors is an integer number (1378611).

2^2757221 is an apocalyptic number.

It is an amenable number.

2757221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2757221 is an equidigital number, since it uses as much as digits as its factorization.

2757221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1960, while the sum is 26.

The square root of 2757221 is about 1660.4881812286. The cubic root of 2757221 is about 140.2244867870.

The spelling of 2757221 in words is "two million, seven hundred fifty-seven thousand, two hundred twenty-one".