121577317 has 2 divisors, whose sum is σ = 121577318. Its totient is φ = 121577316.

The previous prime is 121577279. The next prime is 121577327. The reversal of 121577317 is 713775121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116337796 + 5239521 = 10786^2 + 2289^2 .

It is an emirp because it is prime and its reverse (713775121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121577317 - 2²³ = 113188709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121577327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60788658 + 60788659.

It is an arithmetic number, because the mean of its divisors is an integer number (60788659).

Almost surely, 2^121577317 is an apocalyptic number.

It is an amenable number.

121577317 is a deficient number, since it is larger than the sum of its proper divisors (1).

121577317 is an equidigital number, since it uses as much as digits as its factorization.

121577317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10290, while the sum is 34.

The square root of 121577317 is about 11026.2104550929. The cubic root of 121577317 is about 495.3941247727.

The spelling of 121577317 in words is "one hundred twenty-one million, five hundred seventy-seven thousand, three hundred seventeen".