121971449 has 2 divisors, whose sum is σ = 121971450. Its totient is φ = 121971448.

The previous prime is 121971427. The next prime is 121971491. The reversal of 121971449 is 944179121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81775849 + 40195600 = 9043^2 + 6340^2 .

It is a cyclic number.

It is not a de Polignac number, because 121971449 - 2⁸ = 121971193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121971049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60985724 + 60985725.

It is an arithmetic number, because the mean of its divisors is an integer number (60985725).

Almost surely, 2^121971449 is an apocalyptic number.

It is an amenable number.

121971449 is a deficient number, since it is larger than the sum of its proper divisors (1).

121971449 is an equidigital number, since it uses as much as digits as its factorization.

121971449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The square root of 121971449 is about 11044.0684985199. The cubic root of 121971449 is about 495.9288738303.

The spelling of 121971449 in words is "one hundred twenty-one million, nine hundred seventy-one thousand, four hundred forty-nine".