155317 has 2 divisors, whose sum is σ = 155318. Its totient is φ = 155316.

The previous prime is 155303. The next prime is 155327. The reversal of 155317 is 713551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155236 + 81 = 394^2 + 9^2 .

It is a cyclic number.

It is not a de Polignac number, because 155317 - 2¹¹ = 153269 is a prime.

155317 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155327) 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, 77658 + 77659.

It is an arithmetic number, because the mean of its divisors is an integer number (77659).

2¹⁵⁵³¹⁷ is an apocalyptic number.

It is an amenable number.

155317 is a deficient number, since it is larger than the sum of its proper divisors (1).

155317 is an equidigital number, since it uses as much as digits as its factorization.

155317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 525, while the sum is 22.

The square root of 155317 is about 394.1027784728. The cubic root of 155317 is about 53.7534484898.

Adding to 155317 its reverse (713551), we get a palindrome (868868).

The spelling of 155317 in words is "one hundred fifty-five thousand, three hundred seventeen".