505521401 has 24 divisors (see below), whose sum is σ = 669544896. Its totient is φ = 370725120.

The previous prime is 505521361. The next prime is 505521403. The reversal of 505521401 is 104125505.

It is a happy number.

It is not a de Polignac number, because 505521401 - 2⁶ = 505521337 is a prime.

It is a super-3 number, since 3×505521401³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505521403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10895 + ... + 33611.

It is an arithmetic number, because the mean of its divisors is an integer number (27897704).

Almost surely, 2^505521401 is an apocalyptic number.

It is an amenable number.

505521401 is a deficient number, since it is larger than the sum of its proper divisors (164023495).

505521401 is a wasteful number, since it uses less digits than its factorization.

505521401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22769 (or 22752 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 505521401 is about 22483.8030813295. The cubic root of 505521401 is about 796.6113966624.

Adding to 505521401 its reverse (104125505), we get a palindrome (609646906).

The spelling of 505521401 in words is "five hundred five million, five hundred twenty-one thousand, four hundred one".