721173052 has 12 divisors (see below), whose sum is σ = 1276233840. Its totient is φ = 356534816.

The previous prime is 721173041. The next prime is 721173053. The reversal of 721173052 is 250371127.

It is a self number, because there is not a number n which added to its sum of digits gives 721173052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721173053) 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 3 ways as a sum of consecutive naturals, for example, 1012528 + ... + 1013239.

It is an arithmetic number, because the mean of its divisors is an integer number (106352820).

Almost surely, 2^721173052 is an apocalyptic number.

It is an amenable number.

721173052 is a deficient number, since it is larger than the sum of its proper divisors (555060788).

721173052 is a wasteful number, since it uses less digits than its factorization.

721173052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025860 (or 2025858 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 721173052 is about 26854.6653674925. The cubic root of 721173052 is about 896.7674371314.

The spelling of 721173052 in words is "seven hundred twenty-one million, one hundred seventy-three thousand, fifty-two".