1191641 has 8 divisors (see below), whose sum is σ = 1311744. Its totient is φ = 1073520.

The previous prime is 1191637. The next prime is 1191643. The reversal of 1191641 is 1461911.

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 1191641 - 2² = 1191637 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1191643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 971 + ... + 1823.

It is an arithmetic number, because the mean of its divisors is an integer number (163968).

2^1191641 is an apocalyptic number.

1191641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1191641 is a deficient number, since it is larger than the sum of its proper divisors (120103).

1191641 is a wasteful number, since it uses less digits than its factorization.

1191641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991.

The product of its digits is 216, while the sum is 23.

The square root of 1191641 is about 1091.6231034565. The cubic root of 1191641 is about 106.0185383501.

The spelling of 1191641 in words is "one million, one hundred ninety-one thousand, six hundred forty-one".