1280726831 has 2 divisors, whose sum is σ = 1280726832. Its totient is φ = 1280726830.

The previous prime is 1280726813. The next prime is 1280726851. The reversal of 1280726831 is 1386270821.

Together with previous prime (1280726813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280726831 is a prime.

It is a super-2 number, since 2×1280726831² = 3280522431286605122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280726851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640363415 + 640363416.

It is an arithmetic number, because the mean of its divisors is an integer number (640363416).

Almost surely, 2^1280726831 is an apocalyptic number.

1280726831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280726831 is an equidigital number, since it uses as much as digits as its factorization.

1280726831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 1280726831 is about 35787.2439704429. The cubic root of 1280726831 is about 1085.9725205500.

The spelling of 1280726831 in words is "one billion, two hundred eighty million, seven hundred twenty-six thousand, eight hundred thirty-one".