2551963261 has 2 divisors, whose sum is σ = 2551963262. Its totient is φ = 2551963260.

The previous prime is 2551963247. The next prime is 2551963319. The reversal of 2551963261 is 1623691552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1999431225 + 552532036 = 44715^2 + 23506^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551963261 - 2¹¹ = 2551961213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2551963241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275981630 + 1275981631.

It is an arithmetic number, because the mean of its divisors is an integer number (1275981631).

Almost surely, 2^2551963261 is an apocalyptic number.

It is an amenable number.

2551963261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551963261 is an equidigital number, since it uses as much as digits as its factorization.

2551963261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 40.

The square root of 2551963261 is about 50516.9601322170. The cubic root of 2551963261 is about 1366.5477327065.

The spelling of 2551963261 in words is "two billion, five hundred fifty-one million, nine hundred sixty-three thousand, two hundred sixty-one".