656909441 has 4 divisors (see below), whose sum is σ = 657015984. Its totient is φ = 656802900.

The previous prime is 656909431. The next prime is 656909447. The reversal of 656909441 is 144909656.

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 656909441 - 2⁶ = 656909377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 656909392 and 656909401.

It is not an unprimeable number, because it can be changed into a prime (656909447) 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, 43415 + ... + 56556.

It is an arithmetic number, because the mean of its divisors is an integer number (164253996).

Almost surely, 2^656909441 is an apocalyptic number.

It is an amenable number.

656909441 is a deficient number, since it is larger than the sum of its proper divisors (106543).

656909441 is an equidigital number, since it uses as much as digits as its factorization.

656909441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106542.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 656909441 is about 25630.2446535338. The cubic root of 656909441 is about 869.2976411736.

The spelling of 656909441 in words is "six hundred fifty-six million, nine hundred nine thousand, four hundred forty-one".