155504013 has 16 divisors (see below), whose sum is σ = 237219840. Its totient is φ = 88761456.

The previous prime is 155504009. The next prime is 155504023. The reversal of 155504013 is 310405551.

It is not a de Polignac number, because 155504013 - 2² = 155504009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155504023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18256 + ... + 25382.

It is an arithmetic number, because the mean of its divisors is an integer number (14826240).

Almost surely, 2^155504013 is an apocalyptic number.

It is an amenable number.

155504013 is a deficient number, since it is larger than the sum of its proper divisors (81715827).

155504013 is a wasteful number, since it uses less digits than its factorization.

155504013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8176.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 155504013 is about 12470.1248189423. The cubic root of 155504013 is about 537.7501419447.

Adding to 155504013 its reverse (310405551), we get a palindrome (465909564).

The spelling of 155504013 in words is "one hundred fifty-five million, five hundred four thousand, thirteen".