5813921 has 4 divisors (see below), whose sum is σ = 5971092. Its totient is φ = 5656752.

The previous prime is 5813903. The next prime is 5813989. The reversal of 5813921 is 1293185.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1293185 = 5 ⋅258637.

It can be written as a sum of positive squares in 2 ways, for example, as 2768896 + 3045025 = 1664^2 + 1745^2 .

It is a cyclic number.

It is not a de Polignac number, because 5813921 - 2¹⁴ = 5797537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8813921) 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 3 ways as a sum of consecutive naturals, for example, 78530 + ... + 78603.

It is an arithmetic number, because the mean of its divisors is an integer number (1492773).

Almost surely, 2^5813921 is an apocalyptic number.

It is an amenable number.

5813921 is a deficient number, since it is larger than the sum of its proper divisors (157171).

5813921 is a wasteful number, since it uses less digits than its factorization.

5813921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157170.

The product of its digits is 2160, while the sum is 29.

The square root of 5813921 is about 2411.2073739104. The cubic root of 5813921 is about 179.8138095302.

The spelling of 5813921 in words is "five million, eight hundred thirteen thousand, nine hundred twenty-one".