1247761 has 2 divisors, whose sum is σ = 1247762. Its totient is φ = 1247760.

The previous prime is 1247759. The next prime is 1247767. The reversal of 1247761 is 1677421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1050625 + 197136 = 1025^2 + 444^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247761 - 2¹ = 1247759 is a prime.

Together with 1247759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1247767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623880 + 623881.

It is an arithmetic number, because the mean of its divisors is an integer number (623881).

2^1247761 is an apocalyptic number.

It is an amenable number.

1247761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247761 is an equidigital number, since it uses as much as digits as its factorization.

1247761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 28.

The square root of 1247761 is about 1117.0322287204. The cubic root of 1247761 is about 107.6573790048.

The spelling of 1247761 in words is "one million, two hundred forty-seven thousand, seven hundred sixty-one".