121345649 has 2 divisors, whose sum is σ = 121345650. Its totient is φ = 121345648.

The previous prime is 121345633. The next prime is 121345661. The reversal of 121345649 is 946543121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94926049 + 26419600 = 9743^2 + 5140^2 .

It is a cyclic number.

It is not a de Polignac number, because 121345649 - 2⁴ = 121345633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121345349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60672824 + 60672825.

It is an arithmetic number, because the mean of its divisors is an integer number (60672825).

Almost surely, 2^121345649 is an apocalyptic number.

It is an amenable number.

121345649 is a deficient number, since it is larger than the sum of its proper divisors (1).

121345649 is an equidigital number, since it uses as much as digits as its factorization.

121345649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 121345649 is about 11015.7001139283. The cubic root of 121345649 is about 495.0792635713.

The spelling of 121345649 in words is "one hundred twenty-one million, three hundred forty-five thousand, six hundred forty-nine".