12121541 has 2 divisors, whose sum is σ = 12121542. Its totient is φ = 12121540.

The previous prime is 12121537. The next prime is 12121547. The reversal of 12121541 is 14512121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9302500 + 2819041 = 3050^2 + 1679^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121541 - 2² = 12121537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060770 + 6060771.

It is an arithmetic number, because the mean of its divisors is an integer number (6060771).

Almost surely, 2^12121541 is an apocalyptic number.

It is an amenable number.

12121541 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121541 is an equidigital number, since it uses as much as digits as its factorization.

12121541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80, while the sum is 17.

The square root of 12121541 is about 3481.6003504136. The cubic root of 12121541 is about 229.7131963878.

Adding to 12121541 its reverse (14512121), we get a palindrome (26633662).

The spelling of 12121541 in words is "twelve million, one hundred twenty-one thousand, five hundred forty-one".