911921 has 4 divisors (see below), whose sum is σ = 922992. Its totient is φ = 900852.

The previous prime is 911917. The next prime is 911947. The reversal of 911921 is 129119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 911921 - 2² = 911917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (911951) 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 3 ways as a sum of consecutive naturals, for example, 5411 + ... + 5576.

It is an arithmetic number, because the mean of its divisors is an integer number (230748).

2⁹¹¹⁹²¹ is an apocalyptic number.

It is an amenable number.

911921 is a deficient number, since it is larger than the sum of its proper divisors (11071).

911921 is a wasteful number, since it uses less digits than its factorization.

911921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11070.

The product of its digits is 162, while the sum is 23.

The square root of 911921 is about 954.9455481859. The cubic root of 911921 is about 96.9733515205.

The spelling of 911921 in words is "nine hundred eleven thousand, nine hundred twenty-one".