505611401 has 12 divisors (see below), whose sum is σ = 522255888. Its totient is φ = 489478032.

The previous prime is 505611391. The next prime is 505611443. The reversal of 505611401 is 104116505.

It is not a de Polignac number, because 505611401 - 2¹⁰ = 505610377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (505614401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 309950 + ... + 311576.

It is an arithmetic number, because the mean of its divisors is an integer number (43521324).

Almost surely, 2^505611401 is an apocalyptic number.

It is an amenable number.

505611401 is a deficient number, since it is larger than the sum of its proper divisors (16644487).

505611401 is a wasteful number, since it uses less digits than its factorization.

505611401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928 (or 1891 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 505611401 is about 22485.8044330195. The cubic root of 505611401 is about 796.6586684965.

Adding to 505611401 its reverse (104116505), we get a palindrome (609727906).

The spelling of 505611401 in words is "five hundred five million, six hundred eleven thousand, four hundred one".