1043636491 has 2 divisors, whose sum is σ = 1043636492. Its totient is φ = 1043636490.

The previous prime is 1043636453. The next prime is 1043636507. The reversal of 1043636491 is 1946363401.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1043636491 - 2⁹ = 1043635979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1043636491.

It is not a weakly prime, because it can be changed into another prime (1043639491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521818245 + 521818246.

It is an arithmetic number, because the mean of its divisors is an integer number (521818246).

Almost surely, 2^1043636491 is an apocalyptic number.

1043636491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1043636491 is an equidigital number, since it uses as much as digits as its factorization.

1043636491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 1043636491 is about 32305.3631925103. The cubic root of 1043636491 is about 1014.3389099475.

Adding to 1043636491 its reverse (1946363401), we get a palindrome (2989999892).

The spelling of 1043636491 in words is "one billion, forty-three million, six hundred thirty-six thousand, four hundred ninety-one".