11538487973 has 4 divisors (see below), whose sum is σ = 11541664140. Its totient is φ = 11535311808.

The previous prime is 11538487963. The next prime is 11538487997. The reversal of 11538487973 is 37978483511.

It is a happy number.

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 5757470884 + 5781017089 = 75878^2 + 76033^2 .

It is a cyclic number.

It is not a de Polignac number, because 11538487973 - 2⁴ = 11538487957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11538487913) 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, 1582628 + ... + 1589901.

It is an arithmetic number, because the mean of its divisors is an integer number (2885416035).

Almost surely, 2^11538487973 is an apocalyptic number.

It is an amenable number.

11538487973 is a deficient number, since it is larger than the sum of its proper divisors (3176167).

11538487973 is an equidigital number, since it uses as much as digits as its factorization.

11538487973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176166.

The product of its digits is 5080320, while the sum is 56.

The spelling of 11538487973 in words is "eleven billion, five hundred thirty-eight million, four hundred eighty-seven thousand, nine hundred seventy-three".