12215011541 has 2 divisors, whose sum is σ = 12215011542. Its totient is φ = 12215011540.

The previous prime is 12215011537. The next prime is 12215011577. The reversal of 12215011541 is 14511051221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12058236100 + 156775441 = 109810^2 + 12521^2 .

It is an emirp because it is prime and its reverse (14511051221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12215011541 - 2² = 12215011537 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12215011531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6107505770 + 6107505771.

It is an arithmetic number, because the mean of its divisors is an integer number (6107505771).

Almost surely, 2^12215011541 is an apocalyptic number.

It is an amenable number.

12215011541 is a deficient number, since it is larger than the sum of its proper divisors (1).

12215011541 is an equidigital number, since it uses as much as digits as its factorization.

12215011541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 23.

Adding to 12215011541 its reverse (14511051221), we get a palindrome (26726062762).

The spelling of 12215011541 in words is "twelve billion, two hundred fifteen million, eleven thousand, five hundred forty-one".