1249262081 has 2 divisors, whose sum is σ = 1249262082. Its totient is φ = 1249262080.

The previous prime is 1249262059. The next prime is 1249262107. The reversal of 1249262081 is 1802629421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640899856 + 608362225 = 25316^2 + 24665^2 .

It is an emirp because it is prime and its reverse (1802629421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1249262081 - 2¹⁸ = 1248999937 is a prime.

It is a super-2 number, since 2×1249262081² = 3121311494048901122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1249262011) 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, 624631040 + 624631041.

It is an arithmetic number, because the mean of its divisors is an integer number (624631041).

Almost surely, 2^1249262081 is an apocalyptic number.

It is an amenable number.

1249262081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249262081 is an equidigital number, since it uses as much as digits as its factorization.

1249262081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1249262081 is about 35344.9017681476. The cubic root of 1249262081 is about 1077.0053301849.

The spelling of 1249262081 in words is "one billion, two hundred forty-nine million, two hundred sixty-two thousand, eighty-one".