653870489 has 4 divisors (see below), whose sum is σ = 655551780. Its totient is φ = 652189200.

The previous prime is 653870479. The next prime is 653870521. The reversal of 653870489 is 984078356.

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 221563225 + 432307264 = 14885^2 + 20792^2 .

It is a cyclic number.

It is not a de Polignac number, because 653870489 - 2⁸ = 653870233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (653870479) 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, 840062 + ... + 840839.

It is an arithmetic number, because the mean of its divisors is an integer number (163887945).

Almost surely, 2^653870489 is an apocalyptic number.

It is an amenable number.

653870489 is a deficient number, since it is larger than the sum of its proper divisors (1681291).

653870489 is a wasteful number, since it uses less digits than its factorization.

653870489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681290.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 653870489 is about 25570.8914392909. The cubic root of 653870489 is about 867.9550725506.

The spelling of 653870489 in words is "six hundred fifty-three million, eight hundred seventy thousand, four hundred eighty-nine".