656139229 has 2 divisors, whose sum is σ = 656139230. Its totient is φ = 656139228.

The previous prime is 656139109. The next prime is 656139251. The reversal of 656139229 is 922931656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 653978329 + 2160900 = 25573^2 + 1470^2 .

It is a cyclic number.

It is not a de Polignac number, because 656139229 - 2¹⁹ = 655614941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656169229) 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, 328069614 + 328069615.

It is an arithmetic number, because the mean of its divisors is an integer number (328069615).

Almost surely, 2^656139229 is an apocalyptic number.

It is an amenable number.

656139229 is a deficient number, since it is larger than the sum of its proper divisors (1).

656139229 is an equidigital number, since it uses as much as digits as its factorization.

656139229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 43.

The square root of 656139229 is about 25615.2147951174. The cubic root of 656139229 is about 868.9577641278.

The spelling of 656139229 in words is "six hundred fifty-six million, one hundred thirty-nine thousand, two hundred twenty-nine".