155317120 has 128 divisors (see below), whose sum is σ = 436282560. Its totient is φ = 51757056.

The previous prime is 155317109. The next prime is 155317121. The reversal of 155317120 is 21713551.

155317120 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155317121) 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 15 ways as a sum of consecutive naturals, for example, 165292 + ... + 166228.

Almost surely, 2^155317120 is an apocalyptic number.

155317120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155317120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218141280).

155317120 is an abundant number, since it is smaller than the sum of its proper divisors (280965440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155317120 is an equidigital number, since it uses as much as digits as its factorization.

155317120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000 (or 988 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 25.

The square root of 155317120 is about 12462.6289361434. The cubic root of 155317120 is about 537.5346233330.

It can be divided in two parts, 15 and 5317120, that added together give a palindrome (5317135).

The spelling of 155317120 in words is "one hundred fifty-five million, three hundred seventeen thousand, one hundred twenty".