2549558261 has 2 divisors, whose sum is σ = 2549558262. Its totient is φ = 2549558260.

The previous prime is 2549558243. The next prime is 2549558267. The reversal of 2549558261 is 1628559452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1532331025 + 1017227236 = 39145^2 + 31894^2 .

It is a cyclic number.

It is not a de Polignac number, because 2549558261 - 2¹⁸ = 2549296117 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 (2549558267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1274779130 + 1274779131.

It is an arithmetic number, because the mean of its divisors is an integer number (1274779131).

Almost surely, 2^2549558261 is an apocalyptic number.

It is an amenable number.

2549558261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2549558261 is an equidigital number, since it uses as much as digits as its factorization.

2549558261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864000, while the sum is 47.

The square root of 2549558261 is about 50493.1506345168. The cubic root of 2549558261 is about 1366.1183142642.

The spelling of 2549558261 in words is "two billion, five hundred forty-nine million, five hundred fifty-eight thousand, two hundred sixty-one".