656324401 has 4 divisors (see below), whose sum is σ = 656442100. Its totient is φ = 656206704.

The previous prime is 656324399. The next prime is 656324413. The reversal of 656324401 is 104423656.

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

It can be written as a sum of positive squares in 2 ways, for example, as 293231376 + 363093025 = 17124^2 + 19055^2 .

It is a cyclic number.

It is not a de Polignac number, because 656324401 - 2¹ = 656324399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656324701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50046 + ... + 61783.

It is an arithmetic number, because the mean of its divisors is an integer number (164110525).

Almost surely, 2^656324401 is an apocalyptic number.

It is an amenable number.

656324401 is a deficient number, since it is larger than the sum of its proper divisors (117699).

656324401 is a wasteful number, since it uses less digits than its factorization.

656324401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117698.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 656324401 is about 25618.8290325690. The cubic root of 656324401 is about 869.0395005976.

The spelling of 656324401 in words is "six hundred fifty-six million, three hundred twenty-four thousand, four hundred one".