731019870009 has 81 divisors (see below), whose sum is σ = 1257415023501. Its totient is φ = 408756965760.

The previous prime is 731019870001. The next prime is 731019870023. The reversal of 731019870009 is 900078910137.

The square root of 731019870009 is 854997.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 16217258409 + 714802611600 = 127347^2 + 845460^2 .

It is not a de Polignac number, because 731019870009 - 2³ = 731019870001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (731019870001) 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 80 ways as a sum of consecutive naturals, for example, 366792717 + ... + 366794709.

Almost surely, 2^731019870009 is an apocalyptic number.

731019870009 is the 854997-th square number.

731019870009 is the 427499-th centered octagonal number.

It is an amenable number.

731019870009 is a deficient number, since it is larger than the sum of its proper divisors (526395153492).

731019870009 is a wasteful number, since it uses less digits than its factorization.

731019870009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040 (or 2020 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The spelling of 731019870009 in words is "seven hundred thirty-one billion, nineteen million, eight hundred seventy thousand, nine".