4261249081 has 2 divisors, whose sum is σ = 4261249082. Its totient is φ = 4261249080.

The previous prime is 4261249049. The next prime is 4261249129. The reversal of 4261249081 is 1809421624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4008915856 + 252333225 = 63316^2 + 15885^2 .

It is a cyclic number.

It is not a de Polignac number, because 4261249081 - 2⁵ = 4261249049 is a prime.

It is a super-2 number, since 2×4261249081² = 36316487460646689122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4261249081.

It is not a weakly prime, because it can be changed into another prime (4261249381) 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, 2130624540 + 2130624541.

It is an arithmetic number, because the mean of its divisors is an integer number (2130624541).

Almost surely, 2^4261249081 is an apocalyptic number.

It is an amenable number.

4261249081 is a deficient number, since it is larger than the sum of its proper divisors (1).

4261249081 is an equidigital number, since it uses as much as digits as its factorization.

4261249081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 4261249081 is about 65278.2435502059. The cubic root of 4261249081 is about 1621.2337653485.

The spelling of 4261249081 in words is "four billion, two hundred sixty-one million, two hundred forty-nine thousand, eighty-one".