1280140811 has 2 divisors, whose sum is σ = 1280140812. Its totient is φ = 1280140810.

The previous prime is 1280140769. The next prime is 1280140861. The reversal of 1280140811 is 1180410821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280140811 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280140861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640070405 + 640070406.

It is an arithmetic number, because the mean of its divisors is an integer number (640070406).

Almost surely, 2^1280140811 is an apocalyptic number.

1280140811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280140811 is an equidigital number, since it uses as much as digits as its factorization.

1280140811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 26.

The square root of 1280140811 is about 35779.0554794282. The cubic root of 1280140811 is about 1085.8068597467.

The spelling of 1280140811 in words is "one billion, two hundred eighty million, one hundred forty thousand, eight hundred eleven".