156661229 has 2 divisors, whose sum is σ = 156661230. Its totient is φ = 156661228.

The previous prime is 156661223. The next prime is 156661247. The reversal of 156661229 is 922166651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143952004 + 12709225 = 11998^2 + 3565^2 .

It is a cyclic number.

It is not a de Polignac number, because 156661229 - 2¹² = 156657133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 156661192 and 156661201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156661223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78330614 + 78330615.

It is an arithmetic number, because the mean of its divisors is an integer number (78330615).

Almost surely, 2^156661229 is an apocalyptic number.

It is an amenable number.

156661229 is a deficient number, since it is larger than the sum of its proper divisors (1).

156661229 is an equidigital number, since it uses as much as digits as its factorization.

156661229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 156661229 is about 12516.4383512244. The cubic root of 156661229 is about 539.0807737932.

The spelling of 156661229 in words is "one hundred fifty-six million, six hundred sixty-one thousand, two hundred twenty-nine".