2755721 has 2 divisors, whose sum is σ = 2755722. Its totient is φ = 2755720.

The previous prime is 2755693. The next prime is 2755747. The reversal of 2755721 is 1275572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2755600 + 121 = 1660^2 + 11^2 .

It is a cyclic number.

It is not a de Polignac number, because 2755721 - 2¹⁴ = 2739337 is a prime.

It is not a weakly prime, because it can be changed into another prime (2755021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1377860 + 1377861.

It is an arithmetic number, because the mean of its divisors is an integer number (1377861).

2^2755721 is an apocalyptic number.

It is an amenable number.

2755721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2755721 is an equidigital number, since it uses as much as digits as its factorization.

2755721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4900, while the sum is 29.

The square root of 2755721 is about 1660.0364453831. The cubic root of 2755721 is about 140.1990535839.

The spelling of 2755721 in words is "two million, seven hundred fifty-five thousand, seven hundred twenty-one".