656146129 has 2 divisors, whose sum is σ = 656146130. Its totient is φ = 656146128.

The previous prime is 656146111. The next prime is 656146157. The reversal of 656146129 is 921641656.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 407232400 + 248913729 = 20180^2 + 15777^2 .

It is a cyclic number.

It is not a de Polignac number, because 656146129 - 2⁵ = 656146097 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 656146091 and 656146100.

It is not a weakly prime, because it can be changed into another prime (656146109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328073064 + 328073065.

It is an arithmetic number, because the mean of its divisors is an integer number (328073065).

Almost surely, 2^656146129 is an apocalyptic number.

It is an amenable number.

656146129 is a deficient number, since it is larger than the sum of its proper divisors (1).

656146129 is an equidigital number, since it uses as much as digits as its factorization.

656146129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 656146129 is about 25615.3494803409. The cubic root of 656146129 is about 868.9608101213.

The spelling of 656146129 in words is "six hundred fifty-six million, one hundred forty-six thousand, one hundred twenty-nine".