131023335220 has 24 divisors (see below), whose sum is σ = 275375888424. Its totient is φ = 52366118016.

The previous prime is 131023335173. The next prime is 131023335241. The reversal of 131023335220 is 22533320131.

It can be written as a sum of positive squares in 4 ways, for example, as 1397413924 + 129625921296 = 37382^2 + 360036^2 .

It is a super-2 number, since 2×131023335220² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2676139 + ... + 2724658.

It is an arithmetic number, because the mean of its divisors is an integer number (11473995351).

Almost surely, 2^131023335220 is an apocalyptic number.

131023335220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131023335220 is an abundant number, since it is smaller than the sum of its proper divisors (144352553204).

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

131023335220 is a wasteful number, since it uses less digits than its factorization.

131023335220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5402019 (or 5402017 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 25.

Adding to 131023335220 its reverse (22533320131), we get a palindrome (153556655351).

The spelling of 131023335220 in words is "one hundred thirty-one billion, twenty-three million, three hundred thirty-five thousand, two hundred twenty".