500721993 has 10 divisors (see below), whose sum is σ = 747992234. Its totient is φ = 333814608.

The previous prime is 500721979. The next prime is 500721997. The reversal of 500721993 is 399127005.

It can be written as a sum of positive squares in only one way, i.e., 263315529 + 237406464 = 16227^2 + 15408^2 .

It is not a de Polignac number, because 500721993 - 2⁶ = 500721929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (500721997) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3090796 + ... + 3090957.

Almost surely, 2^500721993 is an apocalyptic number.

It is an amenable number.

500721993 is a deficient number, since it is larger than the sum of its proper divisors (247270241).

500721993 is an equidigital number, since it uses as much as digits as its factorization.

500721993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6181765 (or 6181756 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 500721993 is about 22376.8182054554. The cubic root of 500721993 is about 794.0823730650.

Adding to 500721993 its reverse (399127005), we get a palindrome (899848998).

It can be divided in two parts, 5007 and 21993, that added together give a cube (27000 = 30³).

The spelling of 500721993 in words is "five hundred million, seven hundred twenty-one thousand, nine hundred ninety-three".