12148519991 has 16 divisors (see below), whose sum is σ = 13557634560. Its totient is φ = 10818126720.

The previous prime is 12148519979. The next prime is 12148519997. The reversal of 12148519991 is 19991584121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12148519991 - 2²⁶ = 12081411127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12148519997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230306 + ... + 278096.

It is an arithmetic number, because the mean of its divisors is an integer number (847352160).

Almost surely, 2^12148519991 is an apocalyptic number.

12148519991 is a deficient number, since it is larger than the sum of its proper divisors (1409114569).

12148519991 is a wasteful number, since it uses less digits than its factorization.

12148519991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48614.

The product of its digits is 233280, while the sum is 50.

The spelling of 12148519991 in words is "twelve billion, one hundred forty-eight million, five hundred nineteen thousand, nine hundred ninety-one".