1268993591 has 2 divisors, whose sum is σ = 1268993592. Its totient is φ = 1268993590.

The previous prime is 1268993573. The next prime is 1268993617. The reversal of 1268993591 is 1953998621.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268993591 is a prime.

It is a super-2 number, since 2×1268993591² = 3220689467998150562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268993491) 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, 634496795 + 634496796.

It is an arithmetic number, because the mean of its divisors is an integer number (634496796).

Almost surely, 2^1268993591 is an apocalyptic number.

1268993591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268993591 is an equidigital number, since it uses as much as digits as its factorization.

1268993591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 53.

The square root of 1268993591 is about 35622.9363051391. The cubic root of 1268993591 is about 1082.6460014250.

The spelling of 1268993591 in words is "one billion, two hundred sixty-eight million, nine hundred ninety-three thousand, five hundred ninety-one".