9723289731961 has 15 divisors (see below), whose sum is σ = 10534106429673. Its totient is φ = 8974857925800.

The previous prime is 9723289731899. The next prime is 9723289732127. The reversal of 9723289731961 is 1691379823279.

It is a happy number.

The square root of 9723289731961 is 3118219.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4820962357561 + 4902327374400 = 2195669^2 + 2214120^2 .

It is not a de Polignac number, because 9723289731961 - 2¹¹ = 9723289729913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9723289741961) 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 14 ways as a sum of consecutive naturals, for example, 526969786 + ... + 526988236.

Almost surely, 2^{9723289731961} is an apocalyptic number.

9723289731961 is the 3118219-th square number.

9723289731961 is the 1559110-th centered octagonal number.

It is an amenable number.

9723289731961 is a deficient number, since it is larger than the sum of its proper divisors (810816697712).

9723289731961 is an frugal number, since it uses more digits than its factorization.

9723289731961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36954 (or 18464 counting only the distinct ones).

The product of its digits is 61725888, while the sum is 67.

The spelling of 9723289731961 in words is "nine trillion, seven hundred twenty-three billion, two hundred eighty-nine million, seven hundred thirty-one thousand, nine hundred sixty-one".