121717261 has 2 divisors, whose sum is σ = 121717262. Its totient is φ = 121717260.

The previous prime is 121717247. The next prime is 121717279. The reversal of 121717261 is 162717121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121132036 + 585225 = 11006^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 121717261 - 2¹¹ = 121715213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121717231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60858630 + 60858631.

It is an arithmetic number, because the mean of its divisors is an integer number (60858631).

Almost surely, 2^121717261 is an apocalyptic number.

It is an amenable number.

121717261 is a deficient number, since it is larger than the sum of its proper divisors (1).

121717261 is an equidigital number, since it uses as much as digits as its factorization.

121717261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176, while the sum is 28.

The square root of 121717261 is about 11032.5545999102. The cubic root of 121717261 is about 495.5841296570.

The spelling of 121717261 in words is "one hundred twenty-one million, seven hundred seventeen thousand, two hundred sixty-one".