1800155141 has 4 divisors (see below), whose sum is σ = 1802056992. Its totient is φ = 1798253292.

The previous prime is 1800155081. The next prime is 1800155153. The reversal of 1800155141 is 1415510081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1800155141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1800155141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800155341) 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, 949505 + ... + 951398.

It is an arithmetic number, because the mean of its divisors is an integer number (450514248).

Almost surely, 2^1800155141 is an apocalyptic number.

It is an amenable number.

1800155141 is a deficient number, since it is larger than the sum of its proper divisors (1901851).

1800155141 is an equidigital number, since it uses as much as digits as its factorization.

1800155141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901850.

The product of its (nonzero) digits is 800, while the sum is 26.

The square root of 1800155141 is about 42428.2351860173. The cubic root of 1800155141 is about 1216.4753462181.

The spelling of 1800155141 in words is "one billion, eight hundred million, one hundred fifty-five thousand, one hundred forty-one".