121516261 has 2 divisors, whose sum is σ = 121516262. Its totient is φ = 121516260.

The previous prime is 121516259. The next prime is 121516271. The reversal of 121516261 is 162615121.

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., 113848900 + 7667361 = 10670^2 + 2769^2 .

It is a cyclic number.

It is not a de Polignac number, because 121516261 - 2¹ = 121516259 is a prime.

Together with 121516259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121516211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60758130 + 60758131.

It is an arithmetic number, because the mean of its divisors is an integer number (60758131).

Almost surely, 2^121516261 is an apocalyptic number.

It is an amenable number.

121516261 is a deficient number, since it is larger than the sum of its proper divisors (1).

121516261 is an equidigital number, since it uses as much as digits as its factorization.

121516261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 25.

The square root of 121516261 is about 11023.4414317853. The cubic root of 121516261 is about 495.3111820847.

The spelling of 121516261 in words is "one hundred twenty-one million, five hundred sixteen thousand, two hundred sixty-one".