5981320921 has 3 divisors (see below), whose sum is σ = 5981398261. Its totient is φ = 5981243582.

The previous prime is 5981320889. The next prime is 5981320981. The reversal of 5981320921 is 1290231895.

The square root of 5981320921 is 77339.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 5981320921 - 2⁵ = 5981320889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5981320981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 38670 + ... + 116008.

Almost surely, 2^5981320921 is an apocalyptic number.

5981320921 is the 77339-th square number.

5981320921 is the 38670-th centered octagonal number.

It is an amenable number.

5981320921 is a deficient number, since it is larger than the sum of its proper divisors (77340).

5981320921 is an frugal number, since it uses more digits than its factorization.

5981320921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154678 (or 77339 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The cubic root of 5981320921 is about 1815.2329582314.

The spelling of 5981320921 in words is "five billion, nine hundred eighty-one million, three hundred twenty thousand, nine hundred twenty-one".