505646331 has 16 divisors (see below), whose sum is σ = 690666240. Its totient is φ = 328880160.

The previous prime is 505646327. The next prime is 505646347. The reversal of 505646331 is 133646505.

It is not a de Polignac number, because 505646331 - 2² = 505646327 is a prime.

It is a super-2 number, since 2×505646331² = 511356424107523122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 505646292 and 505646301.

It is not an unprimeable number, because it can be changed into a prime (505646381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150690 + ... + 154008.

It is an arithmetic number, because the mean of its divisors is an integer number (43166640).

Almost surely, 2^505646331 is an apocalyptic number.

505646331 is a deficient number, since it is larger than the sum of its proper divisors (185019909).

505646331 is a wasteful number, since it uses less digits than its factorization.

505646331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546.

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 505646331 is about 22486.5811318662. The cubic root of 505646331 is about 796.6770137095.

The spelling of 505646331 in words is "five hundred five million, six hundred forty-six thousand, three hundred thirty-one".