201123987 has 16 divisors (see below), whose sum is σ = 282792960. Its totient is φ = 126794592.

The previous prime is 201123953. The next prime is 201124003. The reversal of 201123987 is 789321102.

It is not a de Polignac number, because 201123987 - 2⁷ = 201123859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201123947) 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 in 15 ways as a sum of consecutive naturals, for example, 31693 + ... + 37505.

It is an arithmetic number, because the mean of its divisors is an integer number (17674560).

Almost surely, 2^201123987 is an apocalyptic number.

201123987 is a deficient number, since it is larger than the sum of its proper divisors (81668973).

201123987 is a wasteful number, since it uses less digits than its factorization.

201123987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6442.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 201123987 is about 14181.8188889860. The cubic root of 201123987 is about 585.8970210856.

The spelling of 201123987 in words is "two hundred one million, one hundred twenty-three thousand, nine hundred eighty-seven".