654741821 has 4 divisors (see below), whose sum is σ = 665839200. Its totient is φ = 643644444.

The previous prime is 654741817. The next prime is 654741827. The reversal of 654741821 is 128147456.

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 654741821 - 2² = 654741817 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 (654741827) 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, 5548601 + ... + 5548718.

It is an arithmetic number, because the mean of its divisors is an integer number (166459800).

Almost surely, 2^654741821 is an apocalyptic number.

It is an amenable number.

654741821 is a deficient number, since it is larger than the sum of its proper divisors (11097379).

654741821 is a wasteful number, since it uses less digits than its factorization.

654741821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11097378.

The product of its digits is 53760, while the sum is 38.

The square root of 654741821 is about 25587.9233428584. The cubic root of 654741821 is about 868.3404400702.

The spelling of 654741821 in words is "six hundred fifty-four million, seven hundred forty-one thousand, eight hundred twenty-one".