656421133 has 2 divisors, whose sum is σ = 656421134. Its totient is φ = 656421132.

The previous prime is 656421113. The next prime is 656421149. The reversal of 656421133 is 331124656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412374249 + 244046884 = 20307^2 + 15622^2 .

It is a cyclic number.

It is not a de Polignac number, because 656421133 - 2²¹ = 654323981 is a prime.

It is a super-3 number, since 3×656421133³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 656421095 and 656421104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656421113) 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 as a sum of consecutive naturals, namely, 328210566 + 328210567.

It is an arithmetic number, because the mean of its divisors is an integer number (328210567).

Almost surely, 2^656421133 is an apocalyptic number.

It is an amenable number.

656421133 is a deficient number, since it is larger than the sum of its proper divisors (1).

656421133 is an equidigital number, since it uses as much as digits as its factorization.

656421133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 656421133 is about 25620.7168713133. The cubic root of 656421133 is about 869.0821927984.

Adding to 656421133 its reverse (331124656), we get a palindrome (987545789).

The spelling of 656421133 in words is "six hundred fifty-six million, four hundred twenty-one thousand, one hundred thirty-three".