921441 has 4 divisors (see below), whose sum is σ = 1228592. Its totient is φ = 614292.

The previous prime is 921409. The next prime is 921457. The reversal of 921441 is 144129.

921441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 921441 - 2⁵ = 921409 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153571 + ... + 153576.

It is an arithmetic number, because the mean of its divisors is an integer number (307148).

2⁹²¹⁴⁴¹ is an apocalyptic number.

It is an amenable number.

921441 is a deficient number, since it is larger than the sum of its proper divisors (307151).

921441 is a wasteful number, since it uses less digits than its factorization.

921441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307150.

The product of its digits is 288, while the sum is 21.

The square root of 921441 is about 959.9171839279. The cubic root of 921441 is about 97.3096351367.

The spelling of 921441 in words is "nine hundred twenty-one thousand, four hundred forty-one".