505867781 has 8 divisors (see below), whose sum is σ = 518770560. Its totient is φ = 493016832.

The previous prime is 505867777. The next prime is 505867807. The reversal of 505867781 is 187768505.

It is a happy number.

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 505867781 - 2² = 505867777 is a prime.

It is a super-2 number, since 2×505867781² = 511804423707727922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505867741) 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, 7205 + ... + 32613.

It is an arithmetic number, because the mean of its divisors is an integer number (64846320).

Almost surely, 2^505867781 is an apocalyptic number.

It is an amenable number.

505867781 is a deficient number, since it is larger than the sum of its proper divisors (12902779).

505867781 is a wasteful number, since it uses less digits than its factorization.

505867781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25915.

The product of its (nonzero) digits is 470400, while the sum is 47.

The square root of 505867781 is about 22491.5046406415. The cubic root of 505867781 is about 796.7932994511.

The spelling of 505867781 in words is "five hundred five million, eight hundred sixty-seven thousand, seven hundred eighty-one".