1191921 has 8 divisors (see below), whose sum is σ = 1682784. Its totient is φ = 747840.

The previous prime is 1191899. The next prime is 1191923. The reversal of 1191921 is 1291911.

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

It is not a de Polignac number, because 1191921 - 2⁷ = 1191793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1191891 and 1191900.

It is not an unprimeable number, because it can be changed into a prime (1191923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11635 + ... + 11736.

It is an arithmetic number, because the mean of its divisors is an integer number (210348).

2^1191921 is an apocalyptic number.

It is an amenable number.

1191921 is a deficient number, since it is larger than the sum of its proper divisors (490863).

1191921 is a wasteful number, since it uses less digits than its factorization.

1191921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23391.

The product of its digits is 162, while the sum is 24.

The square root of 1191921 is about 1091.7513453163. The cubic root of 1191921 is about 106.0268414286.

It can be divided in two parts, 1191 and 921, that added together give a palindrome (2112).

The spelling of 1191921 in words is "one million, one hundred ninety-one thousand, nine hundred twenty-one".