1163634991 has 2 divisors, whose sum is σ = 1163634992. Its totient is φ = 1163634990.

The previous prime is 1163634971. The next prime is 1163635007. The reversal of 1163634991 is 1994363611.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1163634991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1163634931) 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, 581817495 + 581817496.

It is an arithmetic number, because the mean of its divisors is an integer number (581817496).

Almost surely, 2^1163634991 is an apocalyptic number.

1163634991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1163634991 is an equidigital number, since it uses as much as digits as its factorization.

1163634991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 43.

The square root of 1163634991 is about 34112.0944974066. The cubic root of 1163634991 is about 1051.8139441549.

The spelling of 1163634991 in words is "one billion, one hundred sixty-three million, six hundred thirty-four thousand, nine hundred ninety-one".