1385581317121 has 4 divisors (see below), whose sum is σ = 1385642809044. Its totient is φ = 1385519825200.

The previous prime is 1385581317083. The next prime is 1385581317143. The reversal of 1385581317121 is 1217131855831.

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 999872004096 + 385709313025 = 999936^2 + 621055^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385581317121 - 2¹⁹ = 1385580792833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1385581317221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30712150 + ... + 30757231.

It is an arithmetic number, because the mean of its divisors is an integer number (346410702261).

Almost surely, 2^{1385581317121} is an apocalyptic number.

It is an amenable number.

1385581317121 is a deficient number, since it is larger than the sum of its proper divisors (61491923).

1385581317121 is an equidigital number, since it uses as much as digits as its factorization.

1385581317121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61491922.

The product of its digits is 201600, while the sum is 46.

The spelling of 1385581317121 in words is "one trillion, three hundred eighty-five billion, five hundred eighty-one million, three hundred seventeen thousand, one hundred twenty-one".