505831887 has 12 divisors (see below), whose sum is σ = 797068584. Its totient is φ = 306564720.

The previous prime is 505831877. The next prime is 505831897. The reversal of 505831887 is 788138505.

It is a happy number.

505831887 is a `hidden beast` number, since 50 + 583 + 18 + 8 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (505831877) and next prime (505831897).

It is a de Polignac number, because none of the positive numbers 2^k-505831887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505831877) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2554608 + ... + 2554805.

It is an arithmetic number, because the mean of its divisors is an integer number (66422382).

Almost surely, 2^505831887 is an apocalyptic number.

505831887 is a deficient number, since it is larger than the sum of its proper divisors (291236697).

505831887 is a wasteful number, since it uses less digits than its factorization.

505831887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5109430 (or 5109427 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The square root of 505831887 is about 22490.7066807604. The cubic root of 505831887 is about 796.7744534362.

The spelling of 505831887 in words is "five hundred five million, eight hundred thirty-one thousand, eight hundred eighty-seven".