121648987 has 2 divisors, whose sum is σ = 121648988. Its totient is φ = 121648986.

The previous prime is 121648981. The next prime is 121648999. The reversal of 121648987 is 789846121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121648987 - 2¹¹ = 121646939 is a prime.

It is not a weakly prime, because it can be changed into another prime (121648981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60824493 + 60824494.

It is an arithmetic number, because the mean of its divisors is an integer number (60824494).

Almost surely, 2^121648987 is an apocalyptic number.

121648987 is a deficient number, since it is larger than the sum of its proper divisors (1).

121648987 is an equidigital number, since it uses as much as digits as its factorization.

121648987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 46.

The square root of 121648987 is about 11029.4599595810. The cubic root of 121648987 is about 495.4914508292.

The spelling of 121648987 in words is "one hundred twenty-one million, six hundred forty-eight thousand, nine hundred eighty-seven".