654708121 has 4 divisors (see below), whose sum is σ = 664479952. Its totient is φ = 644936292.

The previous prime is 654708113. The next prime is 654708139. The reversal of 654708121 is 121807456.

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 654708121 - 2³ = 654708113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654708151) 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, 4885815 + ... + 4885948.

It is an arithmetic number, because the mean of its divisors is an integer number (166119988).

Almost surely, 2^654708121 is an apocalyptic number.

It is an amenable number.

654708121 is a deficient number, since it is larger than the sum of its proper divisors (9771831).

654708121 is an equidigital number, since it uses as much as digits as its factorization.

654708121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9771830.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 654708121 is about 25587.2648206095. The cubic root of 654708121 is about 868.3255417933.

The spelling of 654708121 in words is "six hundred fifty-four million, seven hundred eight thousand, one hundred twenty-one".