12541978531 has 8 divisors (see below), whose sum is σ = 13287489264. Its totient is φ = 11797328640.

The previous prime is 12541978511. The next prime is 12541978567. The reversal of 12541978531 is 13587914521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12541978531 - 2¹³ = 12541970339 is a prime.

It is a super-2 number, since 2×12541978531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12541978511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185085 + ... + 243598.

It is an arithmetic number, because the mean of its divisors is an integer number (1660936158).

Almost surely, 2^12541978531 is an apocalyptic number.

12541978531 is a deficient number, since it is larger than the sum of its proper divisors (745510733).

12541978531 is a wasteful number, since it uses less digits than its factorization.

12541978531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430421.

The product of its digits is 302400, while the sum is 46.

The spelling of 12541978531 in words is "twelve billion, five hundred forty-one million, nine hundred seventy-eight thousand, five hundred thirty-one".