121257247 has 2 divisors, whose sum is σ = 121257248. Its totient is φ = 121257246.

The previous prime is 121257239. The next prime is 121257263. The reversal of 121257247 is 742752121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121257247 - 2³ = 121257239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121257217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60628623 + 60628624.

It is an arithmetic number, because the mean of its divisors is an integer number (60628624).

Almost surely, 2^121257247 is an apocalyptic number.

121257247 is a deficient number, since it is larger than the sum of its proper divisors (1).

121257247 is an equidigital number, since it uses as much as digits as its factorization.

121257247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7840, while the sum is 31.

The square root of 121257247 is about 11011.6868371744. The cubic root of 121257247 is about 494.9590103119.

The spelling of 121257247 in words is "one hundred twenty-one million, two hundred fifty-seven thousand, two hundred forty-seven".