845002981 has 4 divisors (see below), whose sum is σ = 845397612. Its totient is φ = 844608352.

The previous prime is 845002967. The next prime is 845003041. The reversal of 845002981 is 189200548.

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 201924100 + 643078881 = 14210^2 + 25359^2 .

It is a cyclic number.

It is not a de Polignac number, because 845002981 - 2⁹ = 845002469 is a prime.

It is a super-2 number, since 2×845002981² = 1428060075797772722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 845002981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845002381) 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 3 ways as a sum of consecutive naturals, for example, 194086 + ... + 198391.

It is an arithmetic number, because the mean of its divisors is an integer number (211349403).

Almost surely, 2^845002981 is an apocalyptic number.

It is an amenable number.

845002981 is a deficient number, since it is larger than the sum of its proper divisors (394631).

845002981 is a wasteful number, since it uses less digits than its factorization.

845002981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394630.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 845002981 is about 29068.9349822108. The cubic root of 845002981 is about 945.4083063362.

The spelling of 845002981 in words is "eight hundred forty-five million, two thousand, nine hundred eighty-one".