131247220 has 24 divisors (see below), whose sum is σ = 296821224. Its totient is φ = 48460416.

The previous prime is 131247217. The next prime is 131247253. The reversal of 131247220 is 22742131.

It can be written as a sum of positive squares in 4 ways, for example, as 25280784 + 105966436 = 5028^2 + 10294^2 .

It is a junction number, because it is equal to n+sod(n) for n = 131247191 and 131247200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252139 + ... + 252658.

It is an arithmetic number, because the mean of its divisors is an integer number (12367551).

Almost surely, 2^131247220 is an apocalyptic number.

131247220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131247220 is an abundant number, since it is smaller than the sum of its proper divisors (165574004).

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

131247220 is a wasteful number, since it uses less digits than its factorization.

131247220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504819 (or 504817 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 131247220 is about 11456.3179076002. The cubic root of 131247220 is about 508.1945903416.

Adding to 131247220 its reverse (22742131), we get a palindrome (153989351).

The spelling of 131247220 in words is "one hundred thirty-one million, two hundred forty-seven thousand, two hundred twenty".