201017987 has 2 divisors, whose sum is σ = 201017988. Its totient is φ = 201017986.

The previous prime is 201017959. The next prime is 201017989. The reversal of 201017987 is 789710102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201017987 is a prime.

Together with 201017989, 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 (201017989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100508993 + 100508994.

It is an arithmetic number, because the mean of its divisors is an integer number (100508994).

Almost surely, 2^201017987 is an apocalyptic number.

201017987 is a deficient number, since it is larger than the sum of its proper divisors (1).

201017987 is an equidigital number, since it uses as much as digits as its factorization.

201017987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 201017987 is about 14178.0812171464. The cubic root of 201017987 is about 585.7940729839.

The spelling of 201017987 in words is "two hundred one million, seventeen thousand, nine hundred eighty-seven".