505412991 has 6 divisors (see below), whose sum is σ = 730041000. Its totient is φ = 336941988.

The previous prime is 505412951. The next prime is 505412993. The reversal of 505412991 is 199214505.

505412991 is a `hidden beast` number, since 5 + 0 + 541 + 29 + 91 = 666.

It is not a de Polignac number, because 505412991 - 2¹⁷ = 505281919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505412993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28078491 + ... + 28078508.

It is an arithmetic number, because the mean of its divisors is an integer number (121673500).

Almost surely, 2^505412991 is an apocalyptic number.

505412991 is a deficient number, since it is larger than the sum of its proper divisors (224628009).

505412991 is a wasteful number, since it uses less digits than its factorization.

505412991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56157005 (or 56157002 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 505412991 is about 22481.3921054725. The cubic root of 505412991 is about 796.5544476619.

The spelling of 505412991 in words is "five hundred five million, four hundred twelve thousand, nine hundred ninety-one".