654206421 has 8 divisors (see below), whose sum is σ = 951573024. Its totient is φ = 396488720.

The previous prime is 654206407. The next prime is 654206431. The reversal of 654206421 is 124602456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 654206421 - 2¹³ = 654198229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654206431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9912186 + ... + 9912251.

It is an arithmetic number, because the mean of its divisors is an integer number (118946628).

Almost surely, 2^654206421 is an apocalyptic number.

It is an amenable number.

654206421 is a deficient number, since it is larger than the sum of its proper divisors (297366603).

654206421 is a wasteful number, since it uses less digits than its factorization.

654206421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19824451.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 654206421 is about 25577.4592366013. The cubic root of 654206421 is about 868.1036870798.

Adding to 654206421 its reverse (124602456), we get a palindrome (778808877).

The spelling of 654206421 in words is "six hundred fifty-four million, two hundred six thousand, four hundred twenty-one".