155849 has 2 divisors, whose sum is σ = 155850. Its totient is φ = 155848.

The previous prime is 155833. The next prime is 155851. The reversal of 155849 is 948551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144400 + 11449 = 380^2 + 107^2 .

It is an emirp because it is prime and its reverse (948551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155849 - 2⁴ = 155833 is a prime.

Together with 155851, 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 (155809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77924 + 77925.

It is an arithmetic number, because the mean of its divisors is an integer number (77925).

2¹⁵⁵⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

155849 is a deficient number, since it is larger than the sum of its proper divisors (1).

155849 is an equidigital number, since it uses as much as digits as its factorization.

155849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 32.

The square root of 155849 is about 394.7771523277. Note that the first 3 decimals coincide. The cubic root of 155849 is about 53.8147516013.

The spelling of 155849 in words is "one hundred fifty-five thousand, eight hundred forty-nine".