201017988 has 18 divisors (see below), whose sum is σ = 508128894. Its totient is φ = 67005984.

The previous prime is 201017987. The next prime is 201017989. The reversal of 201017988 is 889710102.

It is an interprime number because it is at equal distance from previous prime (201017987) and next prime (201017989).

It can be written as a sum of positive squares in only one way, i.e., 201015684 + 2304 = 14178^2 + 48^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5583833 = 201017988 / (2 + 0 + 1 + 0 + 1 + 7 + 9 + 8 + 8).

It is not an unprimeable number, because it can be changed into a prime (201017987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2791881 + ... + 2791952.

It is an arithmetic number, because the mean of its divisors is an integer number (28229383).

Almost surely, 2^201017988 is an apocalyptic number.

It is an amenable number.

201017988 is an abundant number, since it is smaller than the sum of its proper divisors (307110906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201017988 is a wasteful number, since it uses less digits than its factorization.

201017988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5583843 (or 5583838 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 201017988 is about 14178.0812524121. The cubic root of 201017988 is about 585.7940739552.

The spelling of 201017988 in words is "two hundred one million, seventeen thousand, nine hundred eighty-eight".