121217749 has 2 divisors, whose sum is σ = 121217750. Its totient is φ = 121217748.

The previous prime is 121217711. The next prime is 121217753. The reversal of 121217749 is 947712121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119574225 + 1643524 = 10935^2 + 1282^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121217749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121217149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60608874 + 60608875.

It is an arithmetic number, because the mean of its divisors is an integer number (60608875).

Almost surely, 2^121217749 is an apocalyptic number.

It is an amenable number.

121217749 is a deficient number, since it is larger than the sum of its proper divisors (1).

121217749 is an equidigital number, since it uses as much as digits as its factorization.

121217749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 34.

The square root of 121217749 is about 11009.8932329065. The cubic root of 121217749 is about 494.9052622829.

The spelling of 121217749 in words is "one hundred twenty-one million, two hundred seventeen thousand, seven hundred forty-nine".