1236491 has 2 divisors, whose sum is σ = 1236492. Its totient is φ = 1236490.

The previous prime is 1236481. The next prime is 1236517. The reversal of 1236491 is 1946321.

It is an a-pointer prime, because the next prime (1236517) can be obtained adding 1236491 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1236491 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1236491.

It is not a weakly prime, because it can be changed into another prime (1236481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 618245 + 618246.

It is an arithmetic number, because the mean of its divisors is an integer number (618246).

2^1236491 is an apocalyptic number.

1236491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1236491 is an equidigital number, since it uses as much as digits as its factorization.

1236491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 1236491 is about 1111.9761688094. The cubic root of 1236491 is about 107.3322713353.

The spelling of 1236491 in words is "one million, two hundred thirty-six thousand, four hundred ninety-one".