155315 has 4 divisors (see below), whose sum is σ = 186384. Its totient is φ = 124248.

The previous prime is 155303. The next prime is 155317. The reversal of 155315 is 513551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155315 - 2⁴ = 155299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155317) 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 in 3 ways as a sum of consecutive naturals, for example, 15527 + ... + 15536.

It is an arithmetic number, because the mean of its divisors is an integer number (46596).

2¹⁵⁵³¹⁵ is an apocalyptic number.

155315 is a deficient number, since it is larger than the sum of its proper divisors (31069).

155315 is an equidigital number, since it uses as much as digits as its factorization.

155315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31068.

The product of its digits is 375, while the sum is 20.

The square root of 155315 is about 394.1002410555. The cubic root of 155315 is about 53.7532177630.

Adding to 155315 its reverse (513551), we get a palindrome (668866).

The spelling of 155315 in words is "one hundred fifty-five thousand, three hundred fifteen".