654840517 has 4 divisors (see below), whose sum is σ = 656973856. Its totient is φ = 652707180.

The previous prime is 654840509. The next prime is 654840523. The reversal of 654840517 is 715048456.

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 654840517 - 2³ = 654840509 is a prime.

It is a super-2 number, since 2×654840517² = 857632205409654578, which contains 22 as substring.

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 654840517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654840617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066209 + ... + 1066822.

It is an arithmetic number, because the mean of its divisors is an integer number (164243464).

Almost surely, 2^654840517 is an apocalyptic number.

It is an amenable number.

654840517 is a deficient number, since it is larger than the sum of its proper divisors (2133339).

654840517 is a wasteful number, since it uses less digits than its factorization.

654840517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133338.

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 654840517 is about 25589.8518362260. The cubic root of 654840517 is about 868.3840691870.

The spelling of 654840517 in words is "six hundred fifty-four million, eight hundred forty thousand, five hundred seventeen".