12049531531 has 4 divisors (see below), whose sum is σ = 12049866072. Its totient is φ = 12049196992.

The previous prime is 12049531513. The next prime is 12049531553. The reversal of 12049531531 is 13513594021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13513594021 = 269 ⋅50236409.

It is a cyclic number.

It is not a de Polignac number, because 12049531531 - 2⁵ = 12049531499 is a prime.

It is a super-2 number, since 2×12049531531² (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 (12049531231) 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, 105685 + ... + 187798.

It is an arithmetic number, because the mean of its divisors is an integer number (3012466518).

Almost surely, 2^12049531531 is an apocalyptic number.

12049531531 is a deficient number, since it is larger than the sum of its proper divisors (334541).

12049531531 is an equidigital number, since it uses as much as digits as its factorization.

12049531531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334540.

The product of its (nonzero) digits is 16200, while the sum is 34.

The spelling of 12049531531 in words is "twelve billion, forty-nine million, five hundred thirty-one thousand, five hundred thirty-one".