1803921961 has 8 divisors (see below), whose sum is σ = 1862651648. Its totient is φ = 1745226000.

The previous prime is 1803921941. The next prime is 1803921967. The reversal of 1803921961 is 1691293081.

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 1803921961 - 2⁵ = 1803921929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1803921967) 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, 144706 + ... + 156676.

It is an arithmetic number, because the mean of its divisors is an integer number (232831456).

Almost surely, 2^1803921961 is an apocalyptic number.

It is an amenable number.

1803921961 is a deficient number, since it is larger than the sum of its proper divisors (58729687).

1803921961 is a wasteful number, since it uses less digits than its factorization.

1803921961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16863.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 1803921961 is about 42472.6024750073. The cubic root of 1803921961 is about 1217.3232455942.

It can be divided in two parts, 18039 and 21961, that added together give a square (40000 = 200²).

The spelling of 1803921961 in words is "one billion, eight hundred three million, nine hundred twenty-one thousand, nine hundred sixty-one".