121605251 has 2 divisors, whose sum is σ = 121605252. Its totient is φ = 121605250.

The previous prime is 121605229. The next prime is 121605271. The reversal of 121605251 is 152506121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121605251 - 2¹⁴ = 121588867 is a prime.

It is not a weakly prime, because it can be changed into another prime (121605271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60802625 + 60802626.

It is an arithmetic number, because the mean of its divisors is an integer number (60802626).

Almost surely, 2^121605251 is an apocalyptic number.

121605251 is a deficient number, since it is larger than the sum of its proper divisors (1).

121605251 is an equidigital number, since it uses as much as digits as its factorization.

121605251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 121605251 is about 11027.4770913387. The cubic root of 121605251 is about 495.4320629893.

The spelling of 121605251 in words is "one hundred twenty-one million, six hundred five thousand, two hundred fifty-one".