121345517 has 2 divisors, whose sum is σ = 121345518. Its totient is φ = 121345516.

The previous prime is 121345489. The next prime is 121345519. The reversal of 121345517 is 715543121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120868036 + 477481 = 10994^2 + 691^2 .

It is an emirp because it is prime and its reverse (715543121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121345517 - 2⁶ = 121345453 is a prime.

Together with 121345519, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121345517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121345519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60672758 + 60672759.

It is an arithmetic number, because the mean of its divisors is an integer number (60672759).

Almost surely, 2^121345517 is an apocalyptic number.

It is an amenable number.

121345517 is a deficient number, since it is larger than the sum of its proper divisors (1).

121345517 is an equidigital number, since it uses as much as digits as its factorization.

121345517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 29.

The square root of 121345517 is about 11015.6941224782. The cubic root of 121345517 is about 495.0790840552.

Adding to 121345517 its reverse (715543121), we get a palindrome (836888638).

The spelling of 121345517 in words is "one hundred twenty-one million, three hundred forty-five thousand, five hundred seventeen".