15531200120 has 32 divisors (see below), whose sum is σ = 35537497200. Its totient is φ = 6107182848.

The previous prime is 15531200107. The next prime is 15531200129. The reversal of 15531200120 is 2100213551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 15531200092 and 15531200101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15531200129) 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, 3288149 + ... + 3292868.

Almost surely, 2^15531200120 is an apocalyptic number.

15531200120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15531200120 is an abundant number, since it is smaller than the sum of its proper divisors (20006297080).

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

15531200120 is a wasteful number, since it uses less digits than its factorization.

15531200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6581087 (or 6581083 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

Adding to 15531200120 its reverse (2100213551), we get a palindrome (17631413671).

The spelling of 15531200120 in words is "fifteen billion, five hundred thirty-one million, two hundred thousand, one hundred twenty".