156844109 has 2 divisors, whose sum is σ = 156844110. Its totient is φ = 156844108.

The previous prime is 156844087. The next prime is 156844117. The reversal of 156844109 is 901448651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150136009 + 6708100 = 12253^2 + 2590^2 .

It is an emirp because it is prime and its reverse (901448651) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156844109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156844139) 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, 78422054 + 78422055.

It is an arithmetic number, because the mean of its divisors is an integer number (78422055).

Almost surely, 2^156844109 is an apocalyptic number.

It is an amenable number.

156844109 is a deficient number, since it is larger than the sum of its proper divisors (1).

156844109 is an equidigital number, since it uses as much as digits as its factorization.

156844109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 156844109 is about 12523.7418130525. The cubic root of 156844109 is about 539.2904592723.

The spelling of 156844109 in words is "one hundred fifty-six million, eight hundred forty-four thousand, one hundred nine".