4120887820009 has 3 divisors (see below), whose sum is σ = 4120889850007. Its totient is φ = 4120885790012.

The previous prime is 4120887819967. The next prime is 4120887820031. The reversal of 4120887820009 is 9000287880214.

The square root of 4120887820009 is 2029997.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1155700251225 + 2965187568784 = 1075035^2 + 1721972^2 .

It is not a de Polignac number, because 4120887820009 - 2³⁹ = 3571132006121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4120807820009) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1014999 + ... + 3044995.

Almost surely, 2^{4120887820009} is an apocalyptic number.

4120887820009 is the 2029997-th square number.

4120887820009 is the 1014999-th centered octagonal number.

It is an amenable number.

4120887820009 is a deficient number, since it is larger than the sum of its proper divisors (2029998).

4120887820009 is an frugal number, since it uses more digits than its factorization.

4120887820009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4059994 (or 2029997 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 49.

Multiplying 4120887820009 by its sum of digits (49), we get a square (201923503180441 = 14209979²).

The spelling of 4120887820009 in words is "four trillion, one hundred twenty billion, eight hundred eighty-seven million, eight hundred twenty thousand, nine".