1281615847 has 2 divisors, whose sum is σ = 1281615848. Its totient is φ = 1281615846.

The previous prime is 1281615823. The next prime is 1281615859. The reversal of 1281615847 is 7485161821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1281615847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1281615887) 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, 640807923 + 640807924.

It is an arithmetic number, because the mean of its divisors is an integer number (640807924).

Almost surely, 2^1281615847 is an apocalyptic number.

1281615847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281615847 is an equidigital number, since it uses as much as digits as its factorization.

1281615847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 43.

The square root of 1281615847 is about 35799.6626660085. The cubic root of 1281615847 is about 1086.2237382234.

The spelling of 1281615847 in words is "one billion, two hundred eighty-one million, six hundred fifteen thousand, eight hundred forty-seven".