155291 has 2 divisors, whose sum is σ = 155292. Its totient is φ = 155290.

The previous prime is 155269. The next prime is 155299. The reversal of 155291 is 192551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155291 - 2¹⁰ = 154267 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77645 + 77646.

It is an arithmetic number, because the mean of its divisors is an integer number (77646).

2¹⁵⁵²⁹¹ is an apocalyptic number.

155291 is a deficient number, since it is larger than the sum of its proper divisors (1).

155291 is an equidigital number, since it uses as much as digits as its factorization.

155291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 450, while the sum is 23.

The square root of 155291 is about 394.0697907732. The cubic root of 155291 is about 53.7504488875.

The spelling of 155291 in words is "one hundred fifty-five thousand, two hundred ninety-one".