1001921 has 4 divisors (see below), whose sum is σ = 1036500. Its totient is φ = 967344.

The previous prime is 1001911. The next prime is 1001933. The reversal of 1001921 is 1291001.

1001921 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.

It can be written as a sum of positive squares in 2 ways, for example, as 790321 + 211600 = 889^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001921 - 2¹⁸ = 739777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001896 and 1001905.

It is not an unprimeable number, because it can be changed into a prime (1001911) 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, 17246 + ... + 17303.

It is an arithmetic number, because the mean of its divisors is an integer number (259125).

2^1001921 is an apocalyptic number.

It is an amenable number.

1001921 is a deficient number, since it is larger than the sum of its proper divisors (34579).

1001921 is an equidigital number, since it uses as much as digits as its factorization.

1001921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34578.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1001921 is about 1000.9600391624. The cubic root of 1001921 is about 100.0639923744.

Adding to 1001921 its reverse (1291001), we get a palindrome (2292922).

The spelling of 1001921 in words is "one million, one thousand, nine hundred twenty-one".