505140431 has 8 divisors (see below), whose sum is σ = 538060320. Its totient is φ = 472576768.

The previous prime is 505140347. The next prime is 505140463. The reversal of 505140431 is 134041505.

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 505140431 - 2¹⁰ = 505139407 is a prime.

It is a super-2 number, since 2×505140431² = 510333710061731522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505140397 and 505140406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505140481) 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, 86126 + ... + 91803.

It is an arithmetic number, because the mean of its divisors is an integer number (67257540).

Almost surely, 2^505140431 is an apocalyptic number.

505140431 is a deficient number, since it is larger than the sum of its proper divisors (32919889).

505140431 is a wasteful number, since it uses less digits than its factorization.

505140431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178113.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 505140431 is about 22475.3293857954. The cubic root of 505140431 is about 796.4112328234.

Adding to 505140431 its reverse (134041505), we get a palindrome (639181936).

The spelling of 505140431 in words is "five hundred five million, one hundred forty thousand, four hundred thirty-one".