33640001 has 4 divisors (see below), whose sum is σ = 34274772. Its totient is φ = 33005232.

The previous prime is 33639997. The next prime is 33640003. The reversal of 33640001 is 10004633.

It is a Cunningham number, because it is equal to 5800²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10004633 = 241 ⋅41513.

It can be written as a sum of positive squares in 2 ways, for example, as 24245776 + 9394225 = 4924^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 33640001 - 2² = 33639997 is a prime.

It is a super-2 number, since 2×33640001² = 2263299334560002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33640003) 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, 317306 + ... + 317411.

It is an arithmetic number, because the mean of its divisors is an integer number (8568693).

Almost surely, 2^33640001 is an apocalyptic number.

It is an amenable number.

33640001 is a deficient number, since it is larger than the sum of its proper divisors (634771).

33640001 is an equidigital number, since it uses as much as digits as its factorization.

33640001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634770.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 33640001 is about 5800.0000862069. Note that the first 4 decimals coincide. The cubic root of 33640001 is about 322.8137315163.

Adding to 33640001 its reverse (10004633), we get a palindrome (43644634).

The spelling of 33640001 in words is "thirty-three million, six hundred forty thousand, one".