721061003 has 16 divisors (see below), whose sum is σ = 785798496. Its totient is φ = 657696000.

The previous prime is 721060999. The next prime is 721061009. The reversal of 721061003 is 300160127.

It is a happy number.

721061003 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 721061003 - 2² = 721060999 is a prime.

It is a super-3 number, since 3×721061003³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721061009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446225 + ... + 447837.

It is an arithmetic number, because the mean of its divisors is an integer number (49112406).

Almost surely, 2^721061003 is an apocalyptic number.

721061003 is a deficient number, since it is larger than the sum of its proper divisors (64737493).

721061003 is a wasteful number, since it uses less digits than its factorization.

721061003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2014.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 721061003 is about 26852.5790753886. The cubic root of 721061003 is about 896.7209909981.

The spelling of 721061003 in words is "seven hundred twenty-one million, sixty-one thousand, three".