1804651017129 has 9 divisors (see below), whose sum is σ = 2606723957149. Its totient is φ = 1203097991340.

The previous prime is 1804651017067. The next prime is 1804651017161. The reversal of 1804651017129 is 9217101564081.

The square root of 1804651017129 is 1343373.

It is a perfect power (a square), and thus also a powerful number.

1804651017129 is a `hidden beast` number, since 1 + 8 + 0 + 4 + 6 + 510 + 1 + 7 + 129 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1804651017129 - 2¹¹ = 1804651015081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1804651015129) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3806224 + ... + 4254014.

Almost surely, 2^{1804651017129} is an apocalyptic number.

1804651017129 is the 1343373-rd square number.

1804651017129 is the 671687-th centered octagonal number.

It is an amenable number.

1804651017129 is a deficient number, since it is larger than the sum of its proper divisors (802072940020).

1804651017129 is an frugal number, since it uses more digits than its factorization.

1804651017129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895588 (or 447794 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 1804651017129 in words is "one trillion, eight hundred four billion, six hundred fifty-one million, seventeen thousand, one hundred twenty-nine".