654796921 has 3 divisors (see below), whose sum is σ = 654822511. Its totient is φ = 654771332.

The previous prime is 654796897. The next prime is 654796957. The reversal of 654796921 is 129697456.

It is a happy number.

The square root of 654796921 is 25589.

It is a perfect power (a square), and thus also a powerful number.

654796921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 592386921 + 62410000 = 24339^2 + 7900^2 .

It is not a de Polignac number, because 654796921 - 2⁹ = 654796409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (604796921) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12795 + ... + 38383.

Almost surely, 2^654796921 is an apocalyptic number.

654796921 is the 25589-th square number.

654796921 is the 12795-th centered octagonal number.

It is an amenable number.

654796921 is a deficient number, since it is larger than the sum of its proper divisors (25590).

654796921 is an frugal number, since it uses more digits than its factorization.

654796921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51178 (or 25589 counting only the distinct ones).

The product of its digits is 816480, while the sum is 49.

The cubic root of 654796921 is about 868.3647978729.

Multiplying 654796921 by its sum of digits (49), we get a square (32085049129 = 179123²).

The spelling of 654796921 in words is "six hundred fifty-four million, seven hundred ninety-six thousand, nine hundred twenty-one".