1163148991 has 2 divisors, whose sum is σ = 1163148992. Its totient is φ = 1163148990.

The previous prime is 1163148979. The next prime is 1163149007. The reversal of 1163148991 is 1998413611.

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-1163148991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1163148901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 581574495 + 581574496.

It is an arithmetic number, because the mean of its divisors is an integer number (581574496).

Almost surely, 2^1163148991 is an apocalyptic number.

1163148991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1163148991 is an equidigital number, since it uses as much as digits as its factorization.

1163148991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 43.

The square root of 1163148991 is about 34104.9701803124. The cubic root of 1163148991 is about 1051.6674913687.

The spelling of 1163148991 in words is "one billion, one hundred sixty-three million, one hundred forty-eight thousand, nine hundred ninety-one".