201700643 has 4 divisors (see below), whose sum is σ = 202345368. Its totient is φ = 201055920.

The previous prime is 201700627. The next prime is 201700649. The reversal of 201700643 is 346007102.

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

It is a cyclic number.

It is not a de Polignac number, because 201700643 - 2⁴ = 201700627 is a prime.

It is a super-2 number, since 2×201700643² = 81366298773226898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201700649) 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, 321893 + ... + 322518.

It is an arithmetic number, because the mean of its divisors is an integer number (50586342).

Almost surely, 2^201700643 is an apocalyptic number.

201700643 is a deficient number, since it is larger than the sum of its proper divisors (644725).

201700643 is an equidigital number, since it uses as much as digits as its factorization.

201700643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644724.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 201700643 is about 14202.1351563770. The cubic root of 201700643 is about 586.4564415865.

Adding to 201700643 its reverse (346007102), we get a palindrome (547707745).

The spelling of 201700643 in words is "two hundred one million, seven hundred thousand, six hundred forty-three".