12149431819 has 4 divisors (see below), whose sum is σ = 13885064944. Its totient is φ = 10413798696.

The previous prime is 12149431813. The next prime is 12149431849. The reversal of 12149431819 is 91813494121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12149431819 - 2⁷ = 12149431691 is a prime.

It is a super-2 number, since 2×12149431819² (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 (12149431813) 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, 867816552 + ... + 867816565.

It is an arithmetic number, because the mean of its divisors is an integer number (3471266236).

Almost surely, 2^12149431819 is an apocalyptic number.

12149431819 is a deficient number, since it is larger than the sum of its proper divisors (1735633125).

12149431819 is an equidigital number, since it uses as much as digits as its factorization.

12149431819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735633124.

The product of its digits is 62208, while the sum is 43.

The spelling of 12149431819 in words is "twelve billion, one hundred forty-nine million, four hundred thirty-one thousand, eight hundred nineteen".