505010991 has 8 divisors (see below), whose sum is σ = 675647280. Its totient is φ = 335524352.

The previous prime is 505010983. The next prime is 505011011. The reversal of 505010991 is 199010505.

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 505010991 - 2³ = 505010983 is a prime.

It is a super-2 number, since 2×505010991² = 510072202061604162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505010951) 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, 286386 + ... + 288143.

It is an arithmetic number, because the mean of its divisors is an integer number (84455910).

Almost surely, 2^505010991 is an apocalyptic number.

505010991 is a deficient number, since it is larger than the sum of its proper divisors (170636289).

505010991 is a wasteful number, since it uses less digits than its factorization.

505010991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574825.

The product of its (nonzero) digits is 2025, while the sum is 30.

The square root of 505010991 is about 22472.4495994540. The cubic root of 505010991 is about 796.3432013942.

The spelling of 505010991 in words is "five hundred five million, ten thousand, nine hundred ninety-one".