505521431 has 8 divisors (see below), whose sum is σ = 518910000. Its totient is φ = 492183360.

The previous prime is 505521427. The next prime is 505521437. The reversal of 505521431 is 134125505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 505521431 - 2² = 505521427 is a prime.

It is a super-2 number, since 2×505521431² = 511103834400575522, which contains 22 as substring.

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 505521431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505521437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8105 + ... + 32813.

It is an arithmetic number, because the mean of its divisors is an integer number (64863750).

Almost surely, 2^505521431 is an apocalyptic number.

505521431 is a deficient number, since it is larger than the sum of its proper divisors (13388569).

505521431 is a wasteful number, since it uses less digits than its factorization.

505521431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25249.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 505521431 is about 22483.8037484764. The cubic root of 505521431 is about 796.6114124207.

Adding to 505521431 its reverse (134125505), we get a palindrome (639646936).

The spelling of 505521431 in words is "five hundred five million, five hundred twenty-one thousand, four hundred thirty-one".