1294265261 has 2 divisors, whose sum is σ = 1294265262. Its totient is φ = 1294265260.

The previous prime is 1294265257. The next prime is 1294265293. The reversal of 1294265261 is 1625624921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1212362761 + 81902500 = 34819^2 + 9050^2 .

It is an emirp because it is prime and its reverse (1625624921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1294265261 - 2² = 1294265257 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 (1294265201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647132630 + 647132631.

It is an arithmetic number, because the mean of its divisors is an integer number (647132631).

Almost surely, 2^1294265261 is an apocalyptic number.

It is an amenable number.

1294265261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1294265261 is an equidigital number, since it uses as much as digits as its factorization.

1294265261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 1294265261 is about 35975.8983348575. The cubic root of 1294265261 is about 1089.7856832515.

The spelling of 1294265261 in words is "one billion, two hundred ninety-four million, two hundred sixty-five thousand, two hundred sixty-one".