2755981 has 2 divisors, whose sum is σ = 2755982. Its totient is φ = 2755980.

The previous prime is 2755967. The next prime is 2755997. The reversal of 2755981 is 1895572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2223081 + 532900 = 1491^2 + 730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2755981 is a prime.

It is a super-2 number, since 2×2755981² = 15190862544722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2755981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2750981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1377990 + 1377991.

It is an arithmetic number, because the mean of its divisors is an integer number (1377991).

2^2755981 is an apocalyptic number.

It is an amenable number.

2755981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2755981 is an equidigital number, since it uses as much as digits as its factorization.

2755981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 37.

The square root of 2755981 is about 1660.1147550697. The cubic root of 2755981 is about 140.2034626669.

The spelling of 2755981 in words is "two million, seven hundred fifty-five thousand, nine hundred eighty-one".