2551287181 has 2 divisors, whose sum is σ = 2551287182. Its totient is φ = 2551287180.

The previous prime is 2551287173. The next prime is 2551287227. The reversal of 2551287181 is 1817821552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2496601156 + 54686025 = 49966^2 + 7395^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551287181 - 2³ = 2551287173 is a prime.

It is a super-2 number, since 2×2551287181² = 13018132559869853522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2551287161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275643590 + 1275643591.

It is an arithmetic number, because the mean of its divisors is an integer number (1275643591).

Almost surely, 2^2551287181 is an apocalyptic number.

It is an amenable number.

2551287181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551287181 is an equidigital number, since it uses as much as digits as its factorization.

2551287181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44800, while the sum is 40.

The square root of 2551287181 is about 50510.2680749172. The cubic root of 2551287181 is about 1366.4270442931.

The spelling of 2551287181 in words is "two billion, five hundred fifty-one million, two hundred eighty-seven thousand, one hundred eighty-one".