121648999 has 2 divisors, whose sum is σ = 121649000. Its totient is φ = 121648998.

The previous prime is 121648987. The next prime is 121649029. The reversal of 121648999 is 999846121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (999846121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121648999 - 2¹⁷ = 121517927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121648699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60824499 + 60824500.

It is an arithmetic number, because the mean of its divisors is an integer number (60824500).

Almost surely, 2^121648999 is an apocalyptic number.

121648999 is a deficient number, since it is larger than the sum of its proper divisors (1).

121648999 is an equidigital number, since it uses as much as digits as its factorization.

121648999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 49.

The square root of 121648999 is about 11029.4605035786. The cubic root of 121648999 is about 495.4914671217.

The spelling of 121648999 in words is "one hundred twenty-one million, six hundred forty-eight thousand, nine hundred ninety-nine".