654721927 has 4 divisors (see below), whose sum is σ = 655018936. Its totient is φ = 654424920.

The previous prime is 654721877. The next prime is 654722017. The reversal of 654721927 is 729127456.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 654721927 - 2¹⁹ = 654197639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654728927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145173 + ... + 149614.

It is an arithmetic number, because the mean of its divisors is an integer number (163754734).

Almost surely, 2^654721927 is an apocalyptic number.

654721927 is a deficient number, since it is larger than the sum of its proper divisors (297009).

654721927 is a wasteful number, since it uses less digits than its factorization.

654721927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297008.

The product of its digits is 211680, while the sum is 43.

The square root of 654721927 is about 25587.5346018330. The cubic root of 654721927 is about 868.3316452857.

The spelling of 654721927 in words is "six hundred fifty-four million, seven hundred twenty-one thousand, nine hundred twenty-seven".