1538315365231 has 4 divisors (see below), whose sum is σ = 1538324796712. Its totient is φ = 1538305933752.

The previous prime is 1538315365217. The next prime is 1538315365241. The reversal of 1538315365231 is 1325635138351.

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

It is a cyclic number.

It is not a de Polignac number, because 1538315365231 - 2¹¹ = 1538315363183 is a prime.

It is a super-4 number, since 4×1538315365231⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538315365201) 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, 4466700 + ... + 4798753.

It is an arithmetic number, because the mean of its divisors is an integer number (384581199178).

Almost surely, 2^{1538315365231} is an apocalyptic number.

1538315365231 is a deficient number, since it is larger than the sum of its proper divisors (9431481).

1538315365231 is an equidigital number, since it uses as much as digits as its factorization.

1538315365231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9431480.

The product of its digits is 972000, while the sum is 46.

The spelling of 1538315365231 in words is "one trillion, five hundred thirty-eight billion, three hundred fifteen million, three hundred sixty-five thousand, two hundred thirty-one".