1013921 has 2 divisors, whose sum is σ = 1013922. Its totient is φ = 1013920.

The previous prime is 1013899. The next prime is 1013923. The reversal of 1013921 is 1293101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 883600 + 130321 = 940^2 + 361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1013921 is a prime.

It is a Sophie Germain prime.

Together with 1013923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1013921.

It is not a weakly prime, because it can be changed into another prime (1013923) 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 as a sum of consecutive naturals, namely, 506960 + 506961.

It is an arithmetic number, because the mean of its divisors is an integer number (506961).

2^1013921 is an apocalyptic number.

It is an amenable number.

1013921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1013921 is an equidigital number, since it uses as much as digits as its factorization.

1013921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1013921 is about 1006.9364428801. The cubic root of 1013921 is about 100.4618965641.

It can be divided in two parts, 10 and 13921, that added together give a palindrome (13931).

The spelling of 1013921 in words is "one million, thirteen thousand, nine hundred twenty-one".