1801662913 has 4 divisors (see below), whose sum is σ = 1810998148. Its totient is φ = 1792327680.

The previous prime is 1801662911. The next prime is 1801662931. The reversal of 1801662913 is 3192661081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3192661081 = 17 ⋅187803593.

It can be written as a sum of positive squares in 2 ways, for example, as 950365584 + 851297329 = 30828^2 + 29177^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801662913 - 2¹ = 1801662911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1801662911) 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, 4667328 + ... + 4667713.

It is an arithmetic number, because the mean of its divisors is an integer number (452749537).

Almost surely, 2^1801662913 is an apocalyptic number.

It is an amenable number.

1801662913 is a deficient number, since it is larger than the sum of its proper divisors (9335235).

1801662913 is an equidigital number, since it uses as much as digits as its factorization.

1801662913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9335234.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1801662913 is about 42445.9999646610. Note that the first 4 decimals coincide. The cubic root of 1801662913 is about 1216.8148828086.

The spelling of 1801662913 in words is "one billion, eight hundred one million, six hundred sixty-two thousand, nine hundred thirteen".