12111145531 has 2 divisors, whose sum is σ = 12111145532. Its totient is φ = 12111145530.

The previous prime is 12111145523. The next prime is 12111145537. The reversal of 12111145531 is 13554111121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12111145531 - 2³ = 12111145523 is a prime.

It is a super-2 number, since 2×12111145531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12111145496 and 12111145505.

It is not a weakly prime, because it can be changed into another prime (12111145537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055572765 + 6055572766.

It is an arithmetic number, because the mean of its divisors is an integer number (6055572766).

Almost surely, 2^12111145531 is an apocalyptic number.

12111145531 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111145531 is an equidigital number, since it uses as much as digits as its factorization.

12111145531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 600, while the sum is 25.

Adding to 12111145531 its reverse (13554111121), we get a palindrome (25665256652).

The spelling of 12111145531 in words is "twelve billion, one hundred eleven million, one hundred forty-five thousand, five hundred thirty-one".