155320013 has 8 divisors (see below), whose sum is σ = 164242176. Its totient is φ = 146642400.

The previous prime is 155320001. The next prime is 155320049. The reversal of 155320013 is 310023551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155320013 - 2⁶ = 155319949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155320063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59831 + ... + 62372.

It is an arithmetic number, because the mean of its divisors is an integer number (20530272).

Almost surely, 2^155320013 is an apocalyptic number.

It is an amenable number.

155320013 is a deficient number, since it is larger than the sum of its proper divisors (8922163).

155320013 is a wasteful number, since it uses less digits than its factorization.

155320013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122275.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 155320013 is about 12462.7450026068. The cubic root of 155320013 is about 537.5379607587.

Adding to 155320013 its reverse (310023551), we get a palindrome (465343564).

The spelling of 155320013 in words is "one hundred fifty-five million, three hundred twenty thousand, thirteen".