1149991 has 2 divisors, whose sum is σ = 1149992. Its totient is φ = 1149990.

The previous prime is 1149989. The next prime is 1150027. The reversal of 1149991 is 1999411.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1149991 - 2¹ = 1149989 is a prime.

Together with 1149989, it forms a pair of twin primes.

1149991 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1149901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 574995 + 574996.

It is an arithmetic number, because the mean of its divisors is an integer number (574996).

2^1149991 is an apocalyptic number.

1149991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1149991 is an equidigital number, since it uses as much as digits as its factorization.

1149991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 34.

The square root of 1149991 is about 1072.3763331965. The cubic root of 1149991 is about 104.7686820061.

The spelling of 1149991 in words is "one million, one hundred forty-nine thousand, nine hundred ninety-one".