2556149 has 2 divisors, whose sum is σ = 2556150. Its totient is φ = 2556148.

The previous prime is 2556143. The next prime is 2556161. The reversal of 2556149 is 9416552.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1737124 + 819025 = 1318^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556149 - 2⁴ = 2556133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2556143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278074 + 1278075.

It is an arithmetic number, because the mean of its divisors is an integer number (1278075).

2^2556149 is an apocalyptic number.

It is an amenable number.

2556149 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556149 is an equidigital number, since it uses as much as digits as its factorization.

2556149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 2556149 is about 1598.7961095775. The cubic root of 2556149 is about 136.7294463370.

The spelling of 2556149 in words is "two million, five hundred fifty-six thousand, one hundred forty-nine".