1801982001 has 4 divisors (see below), whose sum is σ = 2402642672. Its totient is φ = 1201321332.

The previous prime is 1801981999. The next prime is 1801982009. The reversal of 1801982001 is 1002891081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1801982001 - 2¹ = 1801981999 is a prime.

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 1801982001.

It is not an unprimeable number, because it can be changed into a prime (1801982009) 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, 300330331 + ... + 300330336.

It is an arithmetic number, because the mean of its divisors is an integer number (600660668).

Almost surely, 2^1801982001 is an apocalyptic number.

It is an amenable number.

1801982001 is a deficient number, since it is larger than the sum of its proper divisors (600660671).

1801982001 is an equidigital number, since it uses as much as digits as its factorization.

1801982001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600660670.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 1801982001 is about 42449.7585505501. The cubic root of 1801982001 is about 1216.8867142456.

The spelling of 1801982001 in words is "one billion, eight hundred one million, nine hundred eighty-two thousand, one".