12291932581 has 4 divisors (see below), whose sum is σ = 12465058464. Its totient is φ = 12118806700.

The previous prime is 12291932563. The next prime is 12291932591. The reversal of 12291932581 is 18523919221.

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: 18523919221 = 86959 ⋅213019.

It is a cyclic number.

It is not a de Polignac number, because 12291932581 - 2¹¹ = 12291930533 is a prime.

It is a super-2 number, since 2×12291932581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12291932531) 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, 86562835 + ... + 86562976.

It is an arithmetic number, because the mean of its divisors is an integer number (3116264616).

Almost surely, 2^12291932581 is an apocalyptic number.

It is an amenable number.

12291932581 is a deficient number, since it is larger than the sum of its proper divisors (173125883).

12291932581 is an equidigital number, since it uses as much as digits as its factorization.

12291932581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173125882.

The product of its digits is 77760, while the sum is 43.

The spelling of 12291932581 in words is "twelve billion, two hundred ninety-one million, nine hundred thirty-two thousand, five hundred eighty-one".