12491037523 has 2 divisors, whose sum is σ = 12491037524. Its totient is φ = 12491037522.

The previous prime is 12491037511. The next prime is 12491037569. The reversal of 12491037523 is 32573019421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12491037523 is a prime.

It is a super-3 number, since 3×12491037523³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (12491038523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6245518761 + 6245518762.

It is an arithmetic number, because the mean of its divisors is an integer number (6245518762).

Almost surely, 2^12491037523 is an apocalyptic number.

12491037523 is a deficient number, since it is larger than the sum of its proper divisors (1).

12491037523 is an equidigital number, since it uses as much as digits as its factorization.

12491037523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 12491037523 in words is "twelve billion, four hundred ninety-one million, thirty-seven thousand, five hundred twenty-three".