1291799 has 2 divisors, whose sum is σ = 1291800. Its totient is φ = 1291798.

The previous prime is 1291793. The next prime is 1291817. The reversal of 1291799 is 9971921.

It is a weak prime.

It is an emirp because it is prime and its reverse (9971921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1291799 - 2⁴ = 1291783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645899 + 645900.

It is an arithmetic number, because the mean of its divisors is an integer number (645900).

2^1291799 is an apocalyptic number.

1291799 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291799 is an equidigital number, since it uses as much as digits as its factorization.

1291799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 38.

The square root of 1291799 is about 1136.5733588291. The cubic root of 1291799 is about 108.9093036754.

It can be divided in two parts, 129179 and 9, that multiplied together give a palindrome (1162611).

The spelling of 1291799 in words is "one million, two hundred ninety-one thousand, seven hundred ninety-nine".