1191420089 has 8 divisors (see below), whose sum is σ = 1201549440. Its totient is φ = 1181311776.

The previous prime is 1191420077. The next prime is 1191420101. The reversal of 1191420089 is 9800241911.

It is an interprime number because it is at equal distance from previous prime (1191420077) and next prime (1191420101).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1191420089 - 2¹² = 1191415993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1191420889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121172 + ... + 130634.

It is an arithmetic number, because the mean of its divisors is an integer number (150193680).

Almost surely, 2^1191420089 is an apocalyptic number.

It is an amenable number.

1191420089 is a deficient number, since it is larger than the sum of its proper divisors (10129351).

1191420089 is an equidigital number, since it uses as much as digits as its factorization.

1191420089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10519.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1191420089 is about 34516.9536459984. The cubic root of 1191420089 is about 1060.1198657021.

The spelling of 1191420089 in words is "one billion, one hundred ninety-one million, four hundred twenty thousand, eighty-nine".