2820558981 has 8 divisors (see below), whose sum is σ = 3762314784. Its totient is φ = 1879587920.

The previous prime is 2820558973. The next prime is 2820558989. The reversal of 2820558981 is 1898550282.

It is an interprime number because it is at equal distance from previous prime (2820558973) and next prime (2820558989).

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 2820558981 - 2³ = 2820558973 is a prime.

It is a super-2 number, since 2×2820558981² = 15911105930599516722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2820558981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2820558989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187746 + ... + 202211.

It is an arithmetic number, because the mean of its divisors is an integer number (470289348).

Almost surely, 2^2820558981 is an apocalyptic number.

It is an amenable number.

2820558981 is a deficient number, since it is larger than the sum of its proper divisors (941755803).

2820558981 is a wasteful number, since it uses less digits than its factorization.

2820558981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392371.

The product of its (nonzero) digits is 460800, while the sum is 48.

The square root of 2820558981 is about 53108.9350392192. The cubic root of 2820558981 is about 1412.9009872175.

The spelling of 2820558981 in words is "two billion, eight hundred twenty million, five hundred fifty-eight thousand, nine hundred eighty-one".