131345520 has 40 divisors (see below), whose sum is σ = 407171856. Its totient is φ = 35025408.

The previous prime is 131345507. The next prime is 131345549. The reversal of 131345520 is 25543131.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273397 + ... + 273876.

Almost surely, 2^131345520 is an apocalyptic number.

131345520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131345520 is an abundant number, since it is smaller than the sum of its proper divisors (275826336).

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

131345520 is a wasteful number, since it uses less digits than its factorization.

131345520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547289 (or 547283 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 131345520 is about 11460.6073137509. The cubic root of 131345520 is about 508.3214325501.

Adding to 131345520 its reverse (25543131), we get a palindrome (156888651).

The spelling of 131345520 in words is "one hundred thirty-one million, three hundred forty-five thousand, five hundred twenty".