654640001 has 4 divisors (see below), whose sum is σ = 672333012. Its totient is φ = 636946992.

The previous prime is 654639971. The next prime is 654640009. The reversal of 654640001 is 100046456.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 594189376 + 60450625 = 24376^2 + 7775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654640001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654640009) 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, 8846450 + ... + 8846523.

It is an arithmetic number, because the mean of its divisors is an integer number (168083253).

Almost surely, 2^654640001 is an apocalyptic number.

It is an amenable number.

654640001 is a deficient number, since it is larger than the sum of its proper divisors (17693011).

654640001 is a wasteful number, since it uses less digits than its factorization.

654640001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17693010.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 654640001 is about 25585.9336550379. The cubic root of 654640001 is about 868.2954253767.

Adding to 654640001 its reverse (100046456), we get a palindrome (754686457).

The spelling of 654640001 in words is "six hundred fifty-four million, six hundred forty thousand, one".