12115531 has 2 divisors, whose sum is σ = 12115532. Its totient is φ = 12115530.

The previous prime is 12115517. The next prime is 12115547. The reversal of 12115531 is 13551121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12115531 - 2¹¹ = 12113483 is a prime.

It is a super-2 number, since 2×12115531² = 293572182823922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12115499 and 12115508.

It is not a weakly prime, because it can be changed into another prime (12115501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6057765 + 6057766.

It is an arithmetic number, because the mean of its divisors is an integer number (6057766).

Almost surely, 2^12115531 is an apocalyptic number.

12115531 is a deficient number, since it is larger than the sum of its proper divisors (1).

12115531 is an equidigital number, since it uses as much as digits as its factorization.

12115531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150, while the sum is 19.

The square root of 12115531 is about 3480.7371345737. The cubic root of 12115531 is about 229.6752252931.

Adding to 12115531 its reverse (13551121), we get a palindrome (25666652).

The spelling of 12115531 in words is "twelve million, one hundred fifteen thousand, five hundred thirty-one".