121490987 has 2 divisors, whose sum is σ = 121490988. Its totient is φ = 121490986.

The previous prime is 121490969. The next prime is 121491043. The reversal of 121490987 is 789094121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121490987 - 2⁶ = 121490923 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (121490287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60745493 + 60745494.

It is an arithmetic number, because the mean of its divisors is an integer number (60745494).

Almost surely, 2^121490987 is an apocalyptic number.

121490987 is a deficient number, since it is larger than the sum of its proper divisors (1).

121490987 is an equidigital number, since it uses as much as digits as its factorization.

121490987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 121490987 is about 11022.2949969596. The cubic root of 121490987 is about 495.2768400065.

The spelling of 121490987 in words is "one hundred twenty-one million, four hundred ninety thousand, nine hundred eighty-seven".