121603987 has 2 divisors, whose sum is σ = 121603988. Its totient is φ = 121603986.

The previous prime is 121603973. The next prime is 121604029. The reversal of 121603987 is 789306121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121603987 - 2¹¹ = 121601939 is a prime.

It is not a weakly prime, because it can be changed into another prime (121603087) 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, 60801993 + 60801994.

It is an arithmetic number, because the mean of its divisors is an integer number (60801994).

Almost surely, 2^121603987 is an apocalyptic number.

121603987 is a deficient number, since it is larger than the sum of its proper divisors (1).

121603987 is an equidigital number, since it uses as much as digits as its factorization.

121603987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 121603987 is about 11027.4197798034. The cubic root of 121603987 is about 495.4303464289.

The spelling of 121603987 in words is "one hundred twenty-one million, six hundred three thousand, nine hundred eighty-seven".