1801947159 has 12 divisors (see below), whose sum is σ = 2651922936. Its totient is φ = 1178631792.

The previous prime is 1801947149. The next prime is 1801947193. The reversal of 1801947159 is 9517491081.

It is a happy number.

It is not a de Polignac number, because 1801947159 - 2⁷ = 1801947031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801947109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1888357 + ... + 1889310.

It is an arithmetic number, because the mean of its divisors is an integer number (220993578).

Almost surely, 2^1801947159 is an apocalyptic number.

1801947159 is a deficient number, since it is larger than the sum of its proper divisors (849975777).

1801947159 is a wasteful number, since it uses less digits than its factorization.

1801947159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3777726 (or 3777723 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 45.

The square root of 1801947159 is about 42449.3481575395. The cubic root of 1801947159 is about 1216.8788712075.

The spelling of 1801947159 in words is "one billion, eight hundred one million, nine hundred forty-seven thousand, one hundred fifty-nine".