11582545921 has 4 divisors (see below), whose sum is σ = 11587483312. Its totient is φ = 11577608532.

The previous prime is 11582545913. The next prime is 11582545963. The reversal of 11582545921 is 12954528511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12954528511 = 4049 ⋅3199439.

It is a cyclic number.

It is not a de Polignac number, because 11582545921 - 2³ = 11582545913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11582548921) 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, 2465175 + ... + 2469868.

It is an arithmetic number, because the mean of its divisors is an integer number (2896870828).

Almost surely, 2^11582545921 is an apocalyptic number.

It is an amenable number.

11582545921 is a deficient number, since it is larger than the sum of its proper divisors (4937391).

11582545921 is an equidigital number, since it uses as much as digits as its factorization.

11582545921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4937390.

The product of its digits is 144000, while the sum is 43.

The spelling of 11582545921 in words is "eleven billion, five hundred eighty-two million, five hundred forty-five thousand, nine hundred twenty-one".