155801120 has 24 divisors (see below), whose sum is σ = 368080524. Its totient is φ = 62320384.

The previous prime is 155801119. The next prime is 155801131. The reversal of 155801120 is 21108551.

It can be written as a sum of positive squares in 2 ways, for example, as 155650576 + 150544 = 12476^2 + 388^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486719 + ... + 487038.

Almost surely, 2^155801120 is an apocalyptic number.

155801120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155801120 is an abundant number, since it is smaller than the sum of its proper divisors (212279404).

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

155801120 is an equidigital number, since it uses as much as digits as its factorization.

155801120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973772 (or 973764 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 155801120 is about 12482.0318858750. The cubic root of 155801120 is about 538.0924003943.

Adding to 155801120 its reverse (21108551), we get a palindrome (176909671).

The spelling of 155801120 in words is "one hundred fifty-five million, eight hundred one thousand, one hundred twenty".