505000005491 has 4 divisors (see below), whose sum is σ = 505006320984. Its totient is φ = 504993690000.

The previous prime is 505000005481. The next prime is 505000005511. The reversal of 505000005491 is 194500000505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194500000505 = 5 ⋅38900000101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505000005491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505000005401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3036245 + ... + 3198246.

It is an arithmetic number, because the mean of its divisors is an integer number (126251580246).

Almost surely, 2^505000005491 is an apocalyptic number.

505000005491 is a deficient number, since it is larger than the sum of its proper divisors (6315493).

505000005491 is an equidigital number, since it uses as much as digits as its factorization.

505000005491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6315492.

The product of its (nonzero) digits is 4500, while the sum is 29.

Adding to 505000005491 its reverse (194500000505), we get a palindrome (699500005996).

The spelling of 505000005491 in words is "five hundred five billion, five thousand, four hundred ninety-one".