121609949 has 2 divisors, whose sum is σ = 121609950. Its totient is φ = 121609948.

The previous prime is 121609927. The next prime is 121609951. The reversal of 121609949 is 949906121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92987449 + 28622500 = 9643^2 + 5350^2 .

It is a cyclic number.

It is not a de Polignac number, because 121609949 - 2⁸ = 121609693 is a prime.

Together with 121609951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121609909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60804974 + 60804975.

It is an arithmetic number, because the mean of its divisors is an integer number (60804975).

Almost surely, 2^121609949 is an apocalyptic number.

It is an amenable number.

121609949 is a deficient number, since it is larger than the sum of its proper divisors (1).

121609949 is an equidigital number, since it uses as much as digits as its factorization.

121609949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 121609949 is about 11027.6901026462. The cubic root of 121609949 is about 495.4384429492.

The spelling of 121609949 in words is "one hundred twenty-one million, six hundred nine thousand, nine hundred forty-nine".