121506111949 has 2 divisors, whose sum is σ = 121506111950. Its totient is φ = 121506111948.

The previous prime is 121506111929. The next prime is 121506111983. The reversal of 121506111949 is 949111605121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97730013924 + 23776098025 = 312618^2 + 154195^2 .

It is a cyclic number.

It is not a de Polignac number, because 121506111949 - 2⁹ = 121506111437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121506111929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60753055974 + 60753055975.

It is an arithmetic number, because the mean of its divisors is an integer number (60753055975).

Almost surely, 2^121506111949 is an apocalyptic number.

It is an amenable number.

121506111949 is a deficient number, since it is larger than the sum of its proper divisors (1).

121506111949 is an equidigital number, since it uses as much as digits as its factorization.

121506111949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 40.

The spelling of 121506111949 in words is "one hundred twenty-one billion, five hundred six million, one hundred eleven thousand, nine hundred forty-nine".