505541813 has 4 divisors (see below), whose sum is σ = 577762080. Its totient is φ = 433321548.

The previous prime is 505541807. The next prime is 505541821. The reversal of 505541813 is 318145505.

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 not a de Polignac number, because 505541813 - 2²⁸ = 237106357 is a prime.

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 505541813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505541843) 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, 36110123 + ... + 36110136.

It is an arithmetic number, because the mean of its divisors is an integer number (144440520).

Almost surely, 2^505541813 is an apocalyptic number.

It is an amenable number.

505541813 is a deficient number, since it is larger than the sum of its proper divisors (72220267).

505541813 is an equidigital number, since it uses as much as digits as its factorization.

505541813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72220266.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 505541813 is about 22484.2570035125. The cubic root of 505541813 is about 796.6221184063.

The spelling of 505541813 in words is "five hundred five million, five hundred forty-one thousand, eight hundred thirteen".