505406322531 has 24 divisors (see below), whose sum is σ = 796887584064. Its totient is φ = 306118499760.

The previous prime is 505406322527. The next prime is 505406322541. The reversal of 505406322531 is 135223604505.

505406322531 is a `hidden beast` number, since 5 + 0 + 5 + 40 + 63 + 22 + 531 = 666.

It is not a de Polignac number, because 505406322531 - 2² = 505406322527 is a prime.

It is a super-2 number, since 2×505406322531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (505406322511) 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, 1407801 + ... + 1729946.

It is an arithmetic number, because the mean of its divisors is an integer number (33203649336).

Almost surely, 2^505406322531 is an apocalyptic number.

505406322531 is a deficient number, since it is larger than the sum of its proper divisors (291481261533).

505406322531 is a wasteful number, since it uses less digits than its factorization.

505406322531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139391 (or 3139388 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The spelling of 505406322531 in words is "five hundred five billion, four hundred six million, three hundred twenty-two thousand, five hundred thirty-one".