155533120 has 28 divisors (see below), whose sum is σ = 370364004. Its totient is φ = 62213120.

The previous prime is 155533109. The next prime is 155533123. The reversal of 155533120 is 21335551.

It can be written as a sum of positive squares in 2 ways, for example, as 35236096 + 120297024 = 5936^2 + 10968^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155533123) 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, 242701 + ... + 243340.

Almost surely, 2^155533120 is an apocalyptic number.

155533120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155533120 is an abundant number, since it is smaller than the sum of its proper divisors (214830884).

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

155533120 is an equidigital number, since it uses as much as digits as its factorization.

155533120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486058 (or 486048 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 155533120 is about 12471.2918336474. The cubic root of 155533120 is about 537.7836915974.

Adding to 155533120 its reverse (21335551), we get a palindrome (176868671).

The spelling of 155533120 in words is "one hundred fifty-five million, five hundred thirty-three thousand, one hundred twenty".