1188491 has 2 divisors, whose sum is σ = 1188492. Its totient is φ = 1188490.

The previous prime is 1188457. The next prime is 1188511. The reversal of 1188491 is 1948811.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1188491 - 2¹⁴ = 1172107 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (1188991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594245 + 594246.

It is an arithmetic number, because the mean of its divisors is an integer number (594246).

2^1188491 is an apocalyptic number.

1188491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188491 is an equidigital number, since it uses as much as digits as its factorization.

1188491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 32.

The square root of 1188491 is about 1090.1793430441. The cubic root of 1188491 is about 105.9250389679.

The spelling of 1188491 in words is "one million, one hundred eighty-eight thousand, four hundred ninety-one".