9725744137 has 4 divisors (see below), whose sum is σ = 9743205636. Its totient is φ = 9708282640.

The previous prime is 9725744129. The next prime is 9725744141. The reversal of 9725744137 is 7314475279.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1403925961 + 8321818176 = 37469^2 + 91224^2 .

It is a cyclic number.

It is not a de Polignac number, because 9725744137 - 2³ = 9725744129 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9729744137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8729914 + ... + 8731027.

It is an arithmetic number, because the mean of its divisors is an integer number (2435801409).

Almost surely, 2^9725744137 is an apocalyptic number.

It is an amenable number.

9725744137 is a deficient number, since it is larger than the sum of its proper divisors (17461499).

9725744137 is a wasteful number, since it uses less digits than its factorization.

9725744137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17461498.

The product of its digits is 1481760, while the sum is 49.

The square root of 9725744137 is about 98619.1874687680. The cubic root of 9725744137 is about 2134.5562966665.

The spelling of 9725744137 in words is "nine billion, seven hundred twenty-five million, seven hundred forty-four thousand, one hundred thirty-seven".