2001869851 has 4 divisors (see below), whose sum is σ = 2006049600. Its totient is φ = 1997690104.

The previous prime is 2001869839. The next prime is 2001869861. The reversal of 2001869851 is 1589681002.

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

It is a cyclic number.

It is not a de Polignac number, because 2001869851 - 2⁹ = 2001869339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001869861) 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, 2089156 + ... + 2090113.

It is an arithmetic number, because the mean of its divisors is an integer number (501512400).

Almost surely, 2^2001869851 is an apocalyptic number.

2001869851 is a deficient number, since it is larger than the sum of its proper divisors (4179749).

2001869851 is an equidigital number, since it uses as much as digits as its factorization.

2001869851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4179748.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 2001869851 is about 44742.2602357100. The cubic root of 2001869851 is about 1260.3135716999.

The spelling of 2001869851 in words is "two billion, one million, eight hundred sixty-nine thousand, eight hundred fifty-one".