721313831601 has 24 divisors (see below), whose sum is σ = 1136772131040. Its totient is φ = 437099745600.

The previous prime is 721313831591. The next prime is 721313831621. The reversal of 721313831601 is 106138313127.

721313831601 is a `hidden beast` number, since 7 + 2 + 1 + 3 + 13 + 8 + 31 + 601 = 666.

It is not a de Polignac number, because 721313831601 - 2¹⁰ = 721313830577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721313831621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 227170 + ... + 1222388.

It is an arithmetic number, because the mean of its divisors is an integer number (47365505460).

Almost surely, 2^721313831601 is an apocalyptic number.

It is an amenable number.

721313831601 is a deficient number, since it is larger than the sum of its proper divisors (415458299439).

721313831601 is a wasteful number, since it uses less digits than its factorization.

721313831601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002557 (or 1002554 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 721313831601 in words is "seven hundred twenty-one billion, three hundred thirteen million, eight hundred thirty-one thousand, six hundred one".