155581271 has 2 divisors, whose sum is σ = 155581272. Its totient is φ = 155581270.

The previous prime is 155581249. The next prime is 155581273. The reversal of 155581271 is 172185551.

It is a strong prime.

It is an emirp because it is prime and its reverse (172185551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155581271 - 2⁶ = 155581207 is a prime.

Together with 155581273, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155581273) 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, 77790635 + 77790636.

It is an arithmetic number, because the mean of its divisors is an integer number (77790636).

Almost surely, 2^155581271 is an apocalyptic number.

155581271 is a deficient number, since it is larger than the sum of its proper divisors (1).

155581271 is an equidigital number, since it uses as much as digits as its factorization.

155581271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14000, while the sum is 35.

The square root of 155581271 is about 12473.2221578869. Note that the first 3 decimals coincide. The cubic root of 155581271 is about 537.8391827810.

The spelling of 155581271 in words is "one hundred fifty-five million, five hundred eighty-one thousand, two hundred seventy-one".