654238649 has 4 divisors (see below), whose sum is σ = 654360036. Its totient is φ = 654117264.

The previous prime is 654238639. The next prime is 654238691. The reversal of 654238649 is 946832456.

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 231648400 + 422590249 = 15220^2 + 20557^2 .

It is a cyclic number.

It is not a de Polignac number, because 654238649 - 2²⁸ = 385803193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654238639) 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, 52214 + ... + 63519.

It is an arithmetic number, because the mean of its divisors is an integer number (163590009).

Almost surely, 2^654238649 is an apocalyptic number.

It is an amenable number.

654238649 is a deficient number, since it is larger than the sum of its proper divisors (121387).

654238649 is a wasteful number, since it uses less digits than its factorization.

654238649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121386.

The product of its digits is 1244160, while the sum is 47.

The square root of 654238649 is about 25578.0892366885. The cubic root of 654238649 is about 868.1179419008.

The spelling of 654238649 in words is "six hundred fifty-four million, two hundred thirty-eight thousand, six hundred forty-nine".