1809915013 has 4 divisors (see below), whose sum is σ = 1916380620. Its totient is φ = 1703449408.

The previous prime is 1809915001. The next prime is 1809915017. The reversal of 1809915013 is 3105199081.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 536709889 + 1273205124 = 23167^2 + 35682^2 .

It is a cyclic number.

It is not a de Polignac number, because 1809915013 - 2⁹ = 1809914501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809915017) 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, 53232778 + ... + 53232811.

It is an arithmetic number, because the mean of its divisors is an integer number (479095155).

Almost surely, 2^1809915013 is an apocalyptic number.

It is an amenable number.

1809915013 is a deficient number, since it is larger than the sum of its proper divisors (106465607).

1809915013 is a wasteful number, since it uses less digits than its factorization.

1809915013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106465606.

The product of its (nonzero) digits is 9720, while the sum is 37.

The square root of 1809915013 is about 42543.0959498718. The cubic root of 1809915013 is about 1218.6698332788.

The spelling of 1809915013 in words is "one billion, eight hundred nine million, nine hundred fifteen thousand, thirteen".