155052809 has 2 divisors, whose sum is σ = 155052810. Its totient is φ = 155052808.

The previous prime is 155052791. The next prime is 155052811. The reversal of 155052809 is 908250551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154753600 + 299209 = 12440^2 + 547^2 .

It is a cyclic number.

It is not a de Polignac number, because 155052809 - 2⁸ = 155052553 is a prime.

It is a super-3 number, since 3×155052809³ (a number of 26 digits) contains 333 as substring.

Together with 155052811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155052839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77526404 + 77526405.

It is an arithmetic number, because the mean of its divisors is an integer number (77526405).

Almost surely, 2^155052809 is an apocalyptic number.

It is an amenable number.

155052809 is a deficient number, since it is larger than the sum of its proper divisors (1).

155052809 is an equidigital number, since it uses as much as digits as its factorization.

155052809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 155052809 is about 12452.0202778505. The cubic root of 155052809 is about 537.2295335852.

The spelling of 155052809 in words is "one hundred fifty-five million, fifty-two thousand, eight hundred nine".