12045155531 has 4 divisors (see below), whose sum is σ = 12045377064. Its totient is φ = 12044934000.

The previous prime is 12045155519. The next prime is 12045155533. The reversal of 12045155531 is 13555154021.

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

It is a cyclic number.

It is not a de Polignac number, because 12045155531 - 2¹⁰ = 12045154507 is a prime.

It is a super-2 number, since 2×12045155531² (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 (12045155533) 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, 32936 + ... + 158666.

It is an arithmetic number, because the mean of its divisors is an integer number (3011344266).

Almost surely, 2^12045155531 is an apocalyptic number.

12045155531 is a deficient number, since it is larger than the sum of its proper divisors (221533).

12045155531 is an equidigital number, since it uses as much as digits as its factorization.

12045155531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221532.

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 12045155531 in words is "twelve billion, forty-five million, one hundred fifty-five thousand, five hundred thirty-one".