721130606 has 12 divisors (see below), whose sum is σ = 1236396168. Its totient is φ = 309012912.

The previous prime is 721130603. The next prime is 721130609. The reversal of 721130606 is 606031127.

It is an interprime number because it is at equal distance from previous prime (721130603) and next prime (721130609).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721130603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 96890 + ... + 104066.

It is an arithmetic number, because the mean of its divisors is an integer number (103033014).

Almost surely, 2^721130606 is an apocalyptic number.

721130606 is a deficient number, since it is larger than the sum of its proper divisors (515265562).

721130606 is an frugal number, since it uses more digits than its factorization.

721130606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14363 (or 7186 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 721130606 is about 26853.8750648766. The cubic root of 721130606 is about 896.7498431400.

The spelling of 721130606 in words is "seven hundred twenty-one million, one hundred thirty thousand, six hundred six".