845249003281 has 4 divisors (see below), whose sum is σ = 846067251172. Its totient is φ = 844430755392.

The previous prime is 845249003201. The next prime is 845249003323. The reversal of 845249003281 is 182300942548.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 805759364881 + 39489638400 = 897641^2 + 198720^2 .

It is a cyclic number.

It is not a de Polignac number, because 845249003281 - 2¹³ = 845248995089 is a prime.

It is a super-2 number, since 2×845249003281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (845249003201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409122396 + ... + 409124461.

It is an arithmetic number, because the mean of its divisors is an integer number (211516812793).

Almost surely, 2^845249003281 is an apocalyptic number.

It is an amenable number.

845249003281 is a deficient number, since it is larger than the sum of its proper divisors (818247891).

845249003281 is a wasteful number, since it uses less digits than its factorization.

845249003281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818247890.

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 845249003281 in words is "eight hundred forty-five billion, two hundred forty-nine million, three thousand, two hundred eighty-one".