654537509 has 4 divisors (see below), whose sum is σ = 654615840. Its totient is φ = 654459180.

The previous prime is 654537497. The next prime is 654537551. The reversal of 654537509 is 905735456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 654537509 - 2¹⁶ = 654471973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 654537509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654537599) 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, 24899 + ... + 43920.

It is an arithmetic number, because the mean of its divisors is an integer number (163653960).

Almost surely, 2^654537509 is an apocalyptic number.

It is an amenable number.

654537509 is a deficient number, since it is larger than the sum of its proper divisors (78331).

654537509 is an equidigital number, since it uses as much as digits as its factorization.

654537509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78330.

The product of its (nonzero) digits is 567000, while the sum is 44.

The square root of 654537509 is about 25583.9306792369. The cubic root of 654537509 is about 868.2501088774.

The spelling of 654537509 in words is "six hundred fifty-four million, five hundred thirty-seven thousand, five hundred nine".