121787 has 2 divisors, whose sum is σ = 121788. Its totient is φ = 121786.

The previous prime is 121763. The next prime is 121789. The reversal of 121787 is 787121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121787 - 2⁸ = 121531 is a prime.

Together with 121789, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121787.

It is not a weakly prime, because it can be changed into another prime (121789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60893 + 60894.

It is an arithmetic number, because the mean of its divisors is an integer number (60894).

2¹²¹⁷⁸⁷ is an apocalyptic number.

121787 is a deficient number, since it is larger than the sum of its proper divisors (1).

121787 is an equidigital number, since it uses as much as digits as its factorization.

121787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784, while the sum is 26.

The square root of 121787 is about 348.9799421170. The cubic root of 121787 is about 49.5678761382.

The spelling of 121787 in words is "one hundred twenty-one thousand, seven hundred eighty-seven".