9439942857601 has 3 divisors (see below), whose sum is σ = 9439945930051. Its totient is φ = 9439939785152.

The previous prime is 9439942857571. The next prime is 9439942857659. The reversal of 9439942857601 is 1067582499349.

The square root of 9439942857601 is 3072449.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4378342817601 + 5061600040000 = 2092449^2 + 2249800^2 .

It is not a de Polignac number, because 9439942857601 - 2²⁵ = 9439909303169 is a prime.

It is a super-2 number, since 2×9439942857601² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9439942857001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1536225 + ... + 4608673.

It is a 1-persistent number, because it is pandigital, but 2⋅9439942857601 = 18879885715202 is not.

Almost surely, 2^{9439942857601} is an apocalyptic number.

9439942857601 is the 3072449-th square number.

9439942857601 is the 1536225-th centered octagonal number.

It is an amenable number.

9439942857601 is a deficient number, since it is larger than the sum of its proper divisors (3072450).

9439942857601 is an frugal number, since it uses more digits than its factorization.

9439942857601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6144898 (or 3072449 counting only the distinct ones).

The product of its (nonzero) digits is 117573120, while the sum is 67.

The spelling of 9439942857601 in words is "nine trillion, four hundred thirty-nine billion, nine hundred forty-two million, eight hundred fifty-seven thousand, six hundred one".