121331313541 has 2 divisors, whose sum is σ = 121331313542. Its totient is φ = 121331313540.

The previous prime is 121331313527. The next prime is 121331313563. The reversal of 121331313541 is 145313133121.

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., 119545828516 + 1785485025 = 345754^2 + 42255^2 .

It is a cyclic number.

It is not a de Polignac number, because 121331313541 - 2⁷ = 121331313413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121331313841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60665656770 + 60665656771.

It is an arithmetic number, because the mean of its divisors is an integer number (60665656771).

Almost surely, 2^121331313541 is an apocalyptic number.

It is an amenable number.

121331313541 is a deficient number, since it is larger than the sum of its proper divisors (1).

121331313541 is an equidigital number, since it uses as much as digits as its factorization.

121331313541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

Adding to 121331313541 its reverse (145313133121), we get a palindrome (266644446662).

The spelling of 121331313541 in words is "one hundred twenty-one billion, three hundred thirty-one million, three hundred thirteen thousand, five hundred forty-one".