1280993267 has 2 divisors, whose sum is σ = 1280993268. Its totient is φ = 1280993266.

The previous prime is 1280993173. The next prime is 1280993321. The reversal of 1280993267 is 7623990821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1280993267 - 2⁸ = 1280993011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280993867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640496633 + 640496634.

It is an arithmetic number, because the mean of its divisors is an integer number (640496634).

Almost surely, 2^1280993267 is an apocalyptic number.

1280993267 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280993267 is an equidigital number, since it uses as much as digits as its factorization.

1280993267 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 1280993267 is about 35790.9662764223. The cubic root of 1280993267 is about 1086.0478220911.

The spelling of 1280993267 in words is "one billion, two hundred eighty million, nine hundred ninety-three thousand, two hundred sixty-seven".