1261826747 has 2 divisors, whose sum is σ = 1261826748. Its totient is φ = 1261826746.

The previous prime is 1261826653. The next prime is 1261826749. The reversal of 1261826747 is 7476281621.

It is a strong prime.

It is an emirp because it is prime and its reverse (7476281621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261826747 - 2¹² = 1261822651 is a prime.

Together with 1261826749, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1261826698 and 1261826707.

It is not a weakly prime, because it can be changed into another prime (1261826749) 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, 630913373 + 630913374.

It is an arithmetic number, because the mean of its divisors is an integer number (630913374).

Almost surely, 2^1261826747 is an apocalyptic number.

1261826747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261826747 is an equidigital number, since it uses as much as digits as its factorization.

1261826747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 44.

The square root of 1261826747 is about 35522.2007623402. The cubic root of 1261826747 is about 1080.6040136952.

The spelling of 1261826747 in words is "one billion, two hundred sixty-one million, eight hundred twenty-six thousand, seven hundred forty-seven".