121311313 has 2 divisors, whose sum is σ = 121311314. Its totient is φ = 121311312.

The previous prime is 121311293. The next prime is 121311317. The reversal of 121311313 is 313113121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105534529 + 15776784 = 10273^2 + 3972^2 .

It is an emirp because it is prime and its reverse (313113121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121311313 is a prime.

It is not a weakly prime, because it can be changed into another prime (121311317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60655656 + 60655657.

It is an arithmetic number, because the mean of its divisors is an integer number (60655657).

Almost surely, 2^121311313 is an apocalyptic number.

It is an amenable number.

121311313 is a deficient number, since it is larger than the sum of its proper divisors (1).

121311313 is an equidigital number, since it uses as much as digits as its factorization.

121311313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 16.

The square root of 121311313 is about 11014.1415008161. The cubic root of 121311313 is about 495.0325632423.

Adding to 121311313 its reverse (313113121), we get a palindrome (434424434).

The spelling of 121311313 in words is "one hundred twenty-one million, three hundred eleven thousand, three hundred thirteen".