155383909 has 2 divisors, whose sum is σ = 155383910. Its totient is φ = 155383908.

The previous prime is 155383903. The next prime is 155383933. The reversal of 155383909 is 909383551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128187684 + 27196225 = 11322^2 + 5215^2 .

It is an emirp because it is prime and its reverse (909383551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155383909 - 2³ = 155383901 is a prime.

It is a super-2 number, since 2×155383909² = 48288318352240562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155383901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77691954 + 77691955.

It is an arithmetic number, because the mean of its divisors is an integer number (77691955).

Almost surely, 2^155383909 is an apocalyptic number.

It is an amenable number.

155383909 is a deficient number, since it is larger than the sum of its proper divisors (1).

155383909 is an equidigital number, since it uses as much as digits as its factorization.

155383909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145800, while the sum is 43.

The square root of 155383909 is about 12465.3082192138. The cubic root of 155383909 is about 537.6116619645.

The spelling of 155383909 in words is "one hundred fifty-five million, three hundred eighty-three thousand, nine hundred nine".