2551817 has 2 divisors, whose sum is σ = 2551818. Its totient is φ = 2551816.

The previous prime is 2551793. The next prime is 2551823. The reversal of 2551817 is 7181552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2524921 + 26896 = 1589^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551817 - 2²⁰ = 1503241 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2551817.

It is not a weakly prime, because it can be changed into another prime (2551867) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275908 + 1275909.

It is an arithmetic number, because the mean of its divisors is an integer number (1275909).

2^2551817 is an apocalyptic number.

It is an amenable number.

2551817 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551817 is an equidigital number, since it uses as much as digits as its factorization.

2551817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2800, while the sum is 29.

The square root of 2551817 is about 1597.4407657250. The cubic root of 2551817 is about 136.6521625165.

The spelling of 2551817 in words is "two million, five hundred fifty-one thousand, eight hundred seventeen".