155513 has 4 divisors (see below), whose sum is σ = 159348. Its totient is φ = 151680.

The previous prime is 155509. The next prime is 155521. The reversal of 155513 is 315551.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16384 + 139129 = 128^2 + 373^2 .

It is a cyclic number.

It is not a de Polignac number, because 155513 - 2² = 155509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1856 + ... + 1937.

It is an arithmetic number, because the mean of its divisors is an integer number (39837).

2¹⁵⁵⁵¹³ is an apocalyptic number.

It is an amenable number.

155513 is a deficient number, since it is larger than the sum of its proper divisors (3835).

155513 is an equidigital number, since it uses as much as digits as its factorization.

155513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3834.

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

The square root of 155513 is about 394.3513661698. The cubic root of 155513 is about 53.7760501093.

The spelling of 155513 in words is "one hundred fifty-five thousand, five hundred thirteen".