1011921 has 16 divisors (see below), whose sum is σ = 1458240. Its totient is φ = 622080.

The previous prime is 1011917. The next prime is 1011937. The reversal of 1011921 is 1291101.

It is not a de Polignac number, because 1011921 - 2² = 1011917 is a prime.

It is a super-2 number, since 2×1011921² = 2047968220482, which contains 22 as substring.

It is a Curzon number.

1011921 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1011921.

It is not an unprimeable number, because it can be changed into a prime (1011961) 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 15 ways as a sum of consecutive naturals, for example, 2121 + ... + 2553.

It is an arithmetic number, because the mean of its divisors is an integer number (91140).

2^1011921 is an apocalyptic number.

It is an amenable number.

1011921 is a deficient number, since it is larger than the sum of its proper divisors (446319).

1011921 is a wasteful number, since it uses less digits than its factorization.

1011921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496.

The product of its (nonzero) digits is 18, while the sum is 15.

The square root of 1011921 is about 1005.9428413185. The cubic root of 1011921 is about 100.3957980390.

The spelling of 1011921 in words is "one million, eleven thousand, nine hundred twenty-one".