505087917 has 8 divisors (see below), whose sum is σ = 674002560. Its totient is φ = 336449280.

The previous prime is 505087909. The next prime is 505087987. The reversal of 505087917 is 719780505.

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

It is not a de Polignac number, because 505087917 - 2³ = 505087909 is a prime.

It is a super-2 number, since 2×505087917² = 510227607798797778, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505087907) 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, 64692 + ... + 72077.

It is an arithmetic number, because the mean of its divisors is an integer number (84250320).

Almost surely, 2^505087917 is an apocalyptic number.

It is an amenable number.

505087917 is a deficient number, since it is larger than the sum of its proper divisors (168914643).

505087917 is a wasteful number, since it uses less digits than its factorization.

505087917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138003.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 505087917 is about 22474.1610966906. The cubic root of 505087917 is about 796.3836337729.

The spelling of 505087917 in words is "five hundred five million, eighty-seven thousand, nine hundred seventeen".