656442101 has 4 divisors (see below), whose sum is σ = 750219552. Its totient is φ = 562664652.

The previous prime is 656442089. The next prime is 656442107. The reversal of 656442101 is 101244656.

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 656442101 - 2¹⁴ = 656425717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656442107) 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, 46888715 + ... + 46888728.

It is an arithmetic number, because the mean of its divisors is an integer number (187554888).

Almost surely, 2^656442101 is an apocalyptic number.

It is an amenable number.

656442101 is a deficient number, since it is larger than the sum of its proper divisors (93777451).

656442101 is an equidigital number, since it uses as much as digits as its factorization.

656442101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93777450.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 656442101 is about 25621.1260681493. The cubic root of 656442101 is about 869.0914463708.

Adding to 656442101 its reverse (101244656), we get a palindrome (757686757).

The spelling of 656442101 in words is "six hundred fifty-six million, four hundred forty-two thousand, one hundred one".