721530112 has 36 divisors (see below), whose sum is σ = 1442816676. Its totient is φ = 360120320.

The previous prime is 721530101. The next prime is 721530113. The reversal of 721530112 is 211035127.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 516925696 + 204604416 = 22736^2 + 14304^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721530113) 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, 161898 + ... + 166294.

It is an arithmetic number, because the mean of its divisors is an integer number (40078241).

Almost surely, 2^721530112 is an apocalyptic number.

It is an amenable number.

721530112 is a deficient number, since it is larger than the sum of its proper divisors (721286564).

721530112 is an equidigital number, since it uses as much as digits as its factorization.

721530112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5054 (or 5040 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 721530112 is about 26861.3125516978. The cubic root of 721530112 is about 896.9154122256.

Adding to 721530112 its reverse (211035127), we get a palindrome (932565239).

The spelling of 721530112 in words is "seven hundred twenty-one million, five hundred thirty thousand, one hundred twelve".