130311220 has 24 divisors (see below), whose sum is σ = 294704424. Its totient is φ = 48114816.

The previous prime is 130311187. The next prime is 130311227. The reversal of 130311220 is 22113031.

It can be written as a sum of positive squares in 4 ways, for example, as 11370384 + 118940836 = 3372^2 + 10906^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 130311220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130311227) 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, 250339 + ... + 250858.

It is an arithmetic number, because the mean of its divisors is an integer number (12279351).

Almost surely, 2^130311220 is an apocalyptic number.

130311220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

130311220 is an abundant number, since it is smaller than the sum of its proper divisors (164393204).

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

130311220 is a wasteful number, since it uses less digits than its factorization.

130311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501219 (or 501217 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 130311220 is about 11415.3939923246. The cubic root of 130311220 is about 506.9836303486.

Adding to 130311220 its reverse (22113031), we get a palindrome (152424251).

The spelling of 130311220 in words is "one hundred thirty million, three hundred eleven thousand, two hundred twenty".