654903621 has 12 divisors (see below), whose sum is σ = 949390572. Its totient is φ = 435024576.

The previous prime is 654903583. The next prime is 654903629. The reversal of 654903621 is 126309456.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 177262596 + 477641025 = 13314^2 + 21855^2 .

It is not a de Polignac number, because 654903621 - 2¹⁰ = 654902597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654903629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128856 + ... + 133841.

It is an arithmetic number, because the mean of its divisors is an integer number (79115881).

Almost surely, 2^654903621 is an apocalyptic number.

It is an amenable number.

654903621 is a deficient number, since it is larger than the sum of its proper divisors (294486951).

654903621 is a wasteful number, since it uses less digits than its factorization.

654903621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262980 (or 262977 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 654903621 is about 25591.0847952954. The cubic root of 654903621 is about 868.4119623645.

The spelling of 654903621 in words is "six hundred fifty-four million, nine hundred three thousand, six hundred twenty-one".