2550721 has 2 divisors, whose sum is σ = 2550722. Its totient is φ = 2550720.

The previous prime is 2550703. The next prime is 2550727. The reversal of 2550721 is 1270552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2146225 + 404496 = 1465^2 + 636^2 .

It is a cyclic number.

It is not a de Polignac number, because 2550721 - 2⁵ = 2550689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2550692 and 2550701.

It is not a weakly prime, because it can be changed into another prime (2550727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275360 + 1275361.

It is an arithmetic number, because the mean of its divisors is an integer number (1275361).

2^2550721 is an apocalyptic number.

It is an amenable number.

2550721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2550721 is an equidigital number, since it uses as much as digits as its factorization.

2550721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 2550721 is about 1597.0976801686. The cubic root of 2550721 is about 136.6325957768.

The spelling of 2550721 in words is "two million, five hundred fifty thousand, seven hundred twenty-one".