12531591469 has 4 divisors (see below), whose sum is σ = 13076443296. Its totient is φ = 11986739644.

The previous prime is 12531591467. The next prime is 12531591473. The reversal of 12531591469 is 96419513521.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 12531591469 - 2¹ = 12531591467 is a prime.

It is a super-2 number, since 2×12531591469² (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 (12531591467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272425879 + ... + 272425924.

It is an arithmetic number, because the mean of its divisors is an integer number (3269110824).

Almost surely, 2^12531591469 is an apocalyptic number.

It is an amenable number.

12531591469 is a deficient number, since it is larger than the sum of its proper divisors (544851827).

12531591469 is an equidigital number, since it uses as much as digits as its factorization.

12531591469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544851826.

The product of its digits is 291600, while the sum is 46.

The spelling of 12531591469 in words is "twelve billion, five hundred thirty-one million, five hundred ninety-one thousand, four hundred sixty-nine".