203129987 has 2 divisors, whose sum is σ = 203129988. Its totient is φ = 203129986.

The previous prime is 203129981. The next prime is 203129989. The reversal of 203129987 is 789921302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203129987 is a prime.

Together with 203129989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (203129981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101564993 + 101564994.

It is an arithmetic number, because the mean of its divisors is an integer number (101564994).

Almost surely, 2^203129987 is an apocalyptic number.

203129987 is a deficient number, since it is larger than the sum of its proper divisors (1).

203129987 is an equidigital number, since it uses as much as digits as its factorization.

203129987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 203129987 is about 14252.3677681991. The cubic root of 203129987 is about 587.8384826010.

The spelling of 203129987 in words is "two hundred three million, one hundred twenty-nine thousand, nine hundred eighty-seven".