505194989 has 8 divisors (see below), whose sum is σ = 557326392. Its totient is φ = 454959360.

The previous prime is 505194983. The next prime is 505195013. The reversal of 505194989 is 989491505.

It can be written as a sum of positive squares in 4 ways, for example, as 86174089 + 419020900 = 9283^2 + 20470^2 .

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 505194989 - 2²⁰ = 504146413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505194983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473384 + ... + 474449.

It is an arithmetic number, because the mean of its divisors is an integer number (69665799).

Almost surely, 2^505194989 is an apocalyptic number.

It is an amenable number.

505194989 is a deficient number, since it is larger than the sum of its proper divisors (52131403).

505194989 is a wasteful number, since it uses less digits than its factorization.

505194989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947887.

The product of its (nonzero) digits is 583200, while the sum is 50.

The square root of 505194989 is about 22476.5430838463. The cubic root of 505194989 is about 796.4399040847.

The spelling of 505194989 in words is "five hundred five million, one hundred ninety-four thousand, nine hundred eighty-nine".