12011545431 has 16 divisors (see below), whose sum is σ = 18275826400. Its totient is φ = 7791272064.

The previous prime is 12011545421. The next prime is 12011545439. The reversal of 12011545431 is 13454511021.

12011545431 is a `hidden beast` number, since 1 + 2 + 0 + 115 + 4 + 543 + 1 = 666.

It is not a de Polignac number, because 12011545431 - 2⁷ = 12011545303 is a prime.

It is a super-2 number, since 2×12011545431² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011545395 and 12011545404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011545439) 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, 6010786 + ... + 6012783.

It is an arithmetic number, because the mean of its divisors is an integer number (1142239150).

Almost surely, 2^12011545431 is an apocalyptic number.

12011545431 is a deficient number, since it is larger than the sum of its proper divisors (6264280969).

12011545431 is a wasteful number, since it uses less digits than its factorization.

12011545431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12023615 (or 12023609 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 12011545431 in words is "twelve billion, eleven million, five hundred forty-five thousand, four hundred thirty-one".