1151999 has 2 divisors, whose sum is σ = 1152000.
Its totient is φ = 1151998.
The previous prime is 1151993. The next prime is 1152023. The reversal of 1151999 is 9991511.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 1151999 - 212 = 1147903 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1151993) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575999 + 576000.
It is an arithmetic number, because the mean of its divisors is an integer number (576000).
21151999 is an apocalyptic number.
1151999 is a deficient number, since it is larger than the sum of its proper divisors (1).
1151999 is an equidigital number, since it uses as much as digits as its factorization.
1151999 is an evil number, because the sum of its binary digits is even.
The product of its digits is 3645, while the sum is 35.
The square root of 1151999 is about 1073.3121633523.
The cubic root of 1151999 is about 104.8296254357.
The spelling of 1151999 in words is "one million, one hundred fifty-one thousand, nine hundred ninety-nine".