1266421847 has 2 divisors, whose sum is σ = 1266421848. Its totient is φ = 1266421846.

The previous prime is 1266421831. The next prime is 1266421861. The reversal of 1266421847 is 7481246621.

It is a strong prime.

It is an emirp because it is prime and its reverse (7481246621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1266421847 - 2⁴ = 1266421831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266421547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633210923 + 633210924.

It is an arithmetic number, because the mean of its divisors is an integer number (633210924).

Almost surely, 2^1266421847 is an apocalyptic number.

1266421847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266421847 is an equidigital number, since it uses as much as digits as its factorization.

1266421847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 41.

The square root of 1266421847 is about 35586.8212545038. The cubic root of 1266421847 is about 1081.9141428930.

The spelling of 1266421847 in words is "one billion, two hundred sixty-six million, four hundred twenty-one thousand, eight hundred forty-seven".