2553781 has 2 divisors, whose sum is σ = 2553782. Its totient is φ = 2553780.

The previous prime is 2553751. The next prime is 2553797. The reversal of 2553781 is 1873552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2531281 + 22500 = 1591^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 2553781 - 2¹¹ = 2551733 is a prime.

It is a super-2 number, since 2×2553781² = 13043594791922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2553701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1276890 + 1276891.

It is an arithmetic number, because the mean of its divisors is an integer number (1276891).

2^2553781 is an apocalyptic number.

It is an amenable number.

2553781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2553781 is an equidigital number, since it uses as much as digits as its factorization.

2553781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 2553781 is about 1598.0553807675. The cubic root of 2553781 is about 136.6872115323.

The spelling of 2553781 in words is "two million, five hundred fifty-three thousand, seven hundred eighty-one".