1111921 has 2 divisors, whose sum is σ = 1111922. Its totient is φ = 1111920.

The previous prime is 1111897. The next prime is 1111933. The reversal of 1111921 is 1291111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1079521 + 32400 = 1039^2 + 180^2 .

It is an emirp because it is prime and its reverse (1291111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1111921 - 2⁷ = 1111793 is a prime.

1111921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1111895 and 1111904.

It is not a weakly prime, because it can be changed into another prime (1111991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555960 + 555961.

It is an arithmetic number, because the mean of its divisors is an integer number (555961).

2^1111921 is an apocalyptic number.

It is an amenable number.

1111921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111921 is an equidigital number, since it uses as much as digits as its factorization.

1111921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18, while the sum is 16.

The square root of 1111921 is about 1054.4766474418. The cubic root of 1111921 is about 103.5995758841.

It can be divided in two parts, 11 and 11921, that multiplied together give a palindrome (131131).

The spelling of 1111921 in words is "one million, one hundred eleven thousand, nine hundred twenty-one".