1921013 has 2 divisors, whose sum is σ = 1921014. Its totient is φ = 1921012.

The previous prime is 1920991. The next prime is 1921021. The reversal of 1921013 is 3101291.

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., 1435204 + 485809 = 1198^2 + 697^2 .

It is an emirp because it is prime and its reverse (3101291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1921013 - 2¹² = 1916917 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1920982 and 1921000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960506 + 960507.

It is an arithmetic number, because the mean of its divisors is an integer number (960507).

2^1921013 is an apocalyptic number.

It is an amenable number.

1921013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921013 is an equidigital number, since it uses as much as digits as its factorization.

1921013 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 1921013 is about 1386.0061327426. The cubic root of 1921013 is about 124.3111549126.

Subtracting from 1921013 its sum of digits (17), we obtain a square (1920996 = 1386²).

The spelling of 1921013 in words is "one million, nine hundred twenty-one thousand, thirteen".