505090909101 has 4 divisors (see below), whose sum is σ = 673454545472. Its totient is φ = 336727272732.

The previous prime is 505090909079. The next prime is 505090909111. The reversal of 505090909101 is 101909090505.

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 not a de Polignac number, because 505090909101 - 2²³ = 505082520493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 505090909101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505090909111) 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, 84181818181 + ... + 84181818186.

It is an arithmetic number, because the mean of its divisors is an integer number (168363636368).

Almost surely, 2^505090909101 is an apocalyptic number.

It is an amenable number.

505090909101 is a deficient number, since it is larger than the sum of its proper divisors (168363636371).

505090909101 is a wasteful number, since it uses less digits than its factorization.

505090909101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168363636370.

The product of its (nonzero) digits is 18225, while the sum is 39.

Adding to 505090909101 its reverse (101909090505), we get a palindrome (606999999606).

The spelling of 505090909101 in words is "five hundred five billion, ninety million, nine hundred nine thousand, one hundred one".