201688993 has 8 divisors (see below), whose sum is σ = 220947840. Its totient is φ = 182584080.

The previous prime is 201688979. The next prime is 201689017. The reversal of 201688993 is 399886102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201688993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201688973) 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 in 7 ways as a sum of consecutive naturals, for example, 35730 + ... + 40987.

It is an arithmetic number, because the mean of its divisors is an integer number (27618480).

Almost surely, 2^201688993 is an apocalyptic number.

It is an amenable number.

201688993 is a deficient number, since it is larger than the sum of its proper divisors (19258847).

201688993 is a wasteful number, since it uses less digits than its factorization.

201688993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76967.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 201688993 is about 14201.7250008582. The cubic root of 201688993 is about 586.4451503498.

It can be divided in two parts, 20168 and 8993, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 201688993 in words is "two hundred one million, six hundred eighty-eight thousand, nine hundred ninety-three".