505513983 has 12 divisors (see below), whose sum is σ = 729855240. Its totient is φ = 311085216.

The previous prime is 505513979. The next prime is 505513991. The reversal of 505513983 is 389315505.

It is a happy number.

It is not a de Polignac number, because 505513983 - 2² = 505513979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505513913) 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, 498028 + ... + 499041.

It is an arithmetic number, because the mean of its divisors is an integer number (60821270).

Almost surely, 2^505513983 is an apocalyptic number.

505513983 is a deficient number, since it is larger than the sum of its proper divisors (224341257).

505513983 is a wasteful number, since it uses less digits than its factorization.

505513983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997098 (or 997085 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 39.

The square root of 505513983 is about 22483.6381175289. The cubic root of 505513983 is about 796.6075001626.

The spelling of 505513983 in words is "five hundred five million, five hundred thirteen thousand, nine hundred eighty-three".