43155109 has 2 divisors, whose sum is σ = 43155110. Its totient is φ = 43155108.

The previous prime is 43155059. The next prime is 43155139. The reversal of 43155109 is 90155134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36264484 + 6890625 = 6022^2 + 2625^2 .

It is a cyclic number.

It is not a de Polignac number, because 43155109 - 2⁹ = 43154597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43155139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21577554 + 21577555.

It is an arithmetic number, because the mean of its divisors is an integer number (21577555).

Almost surely, 2^43155109 is an apocalyptic number.

It is an amenable number.

43155109 is a deficient number, since it is larger than the sum of its proper divisors (1).

43155109 is an equidigital number, since it uses as much as digits as its factorization.

43155109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 43155109 is about 6569.2548283652. The cubic root of 43155109 is about 350.7605474992.

It can be divided in two parts, 43155 and 109, that added together give a square (43264 = 208²).

The spelling of 43155109 in words is "forty-three million, one hundred fifty-five thousand, one hundred nine".