1187911 has 2 divisors, whose sum is σ = 1187912. Its totient is φ = 1187910.

The previous prime is 1187897. The next prime is 1187933. The reversal of 1187911 is 1197811.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1187911 is a prime.

It is a super-2 number, since 2×1187911² = 2822265087842, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1187911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593955 + 593956.

It is an arithmetic number, because the mean of its divisors is an integer number (593956).

2^1187911 is an apocalyptic number.

1187911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187911 is an equidigital number, since it uses as much as digits as its factorization.

1187911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 28.

The square root of 1187911 is about 1089.9132993041. The cubic root of 1187911 is about 105.9078052042.

The spelling of 1187911 in words is "one million, one hundred eighty-seven thousand, nine hundred eleven".