5645381281 has 8 divisors (see below), whose sum is σ = 5737956224. Its totient is φ = 5553532800.

The previous prime is 5645381249. The next prime is 5645381293. The reversal of 5645381281 is 1821835465.

5645381281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5645381281 - 2⁵ = 5645381249 is a prime.

It is a super-2 number, since 2×5645381281² = 63740659615730401922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5645321281) 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 7 ways as a sum of consecutive naturals, for example, 165936 + ... + 197041.

It is an arithmetic number, because the mean of its divisors is an integer number (717244528).

Almost surely, 2^5645381281 is an apocalyptic number.

It is an amenable number.

5645381281 is a deficient number, since it is larger than the sum of its proper divisors (92574943).

5645381281 is a wasteful number, since it uses less digits than its factorization.

5645381281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363231.

The product of its digits is 230400, while the sum is 43.

The square root of 5645381281 is about 75135.7523486655. The cubic root of 5645381281 is about 1780.5920347909.

The spelling of 5645381281 in words is "five billion, six hundred forty-five million, three hundred eighty-one thousand, two hundred eighty-one".