201242987 has 4 divisors (see below), whose sum is σ = 219537816. Its totient is φ = 182948160.

The previous prime is 201242981. The next prime is 201243011. The reversal of 201242987 is 789242102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201242987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201242981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9147398 + ... + 9147419.

It is an arithmetic number, because the mean of its divisors is an integer number (54884454).

Almost surely, 2^201242987 is an apocalyptic number.

201242987 is a deficient number, since it is larger than the sum of its proper divisors (18294829).

201242987 is a wasteful number, since it uses less digits than its factorization.

201242987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18294828.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 201242987 is about 14186.0137811860. The cubic root of 201242987 is about 586.0125518090.

The spelling of 201242987 in words is "two hundred one million, two hundred forty-two thousand, nine hundred eighty-seven".