1801947001 has 2 divisors, whose sum is σ = 1801947002. Its totient is φ = 1801947000.

The previous prime is 1801946999. The next prime is 1801947031. The reversal of 1801947001 is 1007491081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1363086400 + 438860601 = 36920^2 + 20949^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801947001 - 2¹ = 1801946999 is a prime.

Together with 1801946999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1801947031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900973500 + 900973501.

It is an arithmetic number, because the mean of its divisors is an integer number (900973501).

Almost surely, 2^1801947001 is an apocalyptic number.

It is an amenable number.

1801947001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801947001 is an equidigital number, since it uses as much as digits as its factorization.

1801947001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 1801947001 is about 42449.3462964979. The cubic root of 1801947001 is about 1216.8788356410.

The spelling of 1801947001 in words is "one billion, eight hundred one million, nine hundred forty-seven thousand, one".