1286997263 has 2 divisors, whose sum is σ = 1286997264. Its totient is φ = 1286997262.

The previous prime is 1286997259. The next prime is 1286997329. The reversal of 1286997263 is 3627996821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1286997263 - 2² = 1286997259 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1286997163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643498631 + 643498632.

It is an arithmetic number, because the mean of its divisors is an integer number (643498632).

Almost surely, 2^1286997263 is an apocalyptic number.

1286997263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286997263 is an equidigital number, since it uses as much as digits as its factorization.

1286997263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 1286997263 is about 35874.7440827109. The cubic root of 1286997263 is about 1087.7419412906.

The spelling of 1286997263 in words is "one billion, two hundred eighty-six million, nine hundred ninety-seven thousand, two hundred sixty-three".