1539684072961 has 8 divisors (see below), whose sum is σ = 1585280287400. Its totient is φ = 1494297497088.

The previous prime is 1539684072947. The next prime is 1539684072977. The reversal of 1539684072961 is 1692704869351.

It can be written as a sum of positive squares in 4 ways, for example, as 1098396225936 + 441287847025 = 1048044^2 + 664295^2 .

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 1539684072961 - 2¹³ = 1539684064769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1539684072961.

It is not an unprimeable number, because it can be changed into a prime (1539684072361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52394736 + ... + 52424113.

It is an arithmetic number, because the mean of its divisors is an integer number (198160035925).

It is a 2-persistent number, because it is pandigital, and so is 2⋅1539684072961 = 3079368145922, but 3⋅1539684072961 = 4619052218883 is not.

Almost surely, 2^{1539684072961} is an apocalyptic number.

It is an amenable number.

1539684072961 is a deficient number, since it is larger than the sum of its proper divisors (45596214439).

1539684072961 is a wasteful number, since it uses less digits than its factorization.

1539684072961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104819283.

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 1539684072961 in words is "one trillion, five hundred thirty-nine billion, six hundred eighty-four million, seventy-two thousand, nine hundred sixty-one".