726538931981 has 8 divisors (see below), whose sum is σ = 728981195520. Its totient is φ = 724100525568.

The previous prime is 726538931947. The next prime is 726538931999. The reversal of 726538931981 is 189139835627.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 726538931981 - 2⁶ = 726538931917 is a prime.

It is a super-2 number, since 2×726538931981² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726538931941) 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 7 ways as a sum of consecutive naturals, for example, 586676 + ... + 1340621.

It is an arithmetic number, because the mean of its divisors is an integer number (91122649440).

Almost surely, 2^726538931981 is an apocalyptic number.

It is an amenable number.

726538931981 is a deficient number, since it is larger than the sum of its proper divisors (2442263539).

726538931981 is a wasteful number, since it uses less digits than its factorization.

726538931981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928563.

The product of its digits is 19595520, while the sum is 62.

The spelling of 726538931981 in words is "seven hundred twenty-six billion, five hundred thirty-eight million, nine hundred thirty-one thousand, nine hundred eighty-one".