131440520 has 16 divisors (see below), whose sum is σ = 295741260. Its totient is φ = 52576192.

The previous prime is 131440513. The next prime is 131440531. The reversal of 131440520 is 25044131.

It can be written as a sum of positive squares in 2 ways, for example, as 125574436 + 5866084 = 11206^2 + 2422^2 .

It is a super-2 number, since 2×131440520² = 34553220595740800, which contains 22 as substring.

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 = 131440492 and 131440501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1642967 + ... + 1643046.

Almost surely, 2^131440520 is an apocalyptic number.

131440520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131440520 is an abundant number, since it is smaller than the sum of its proper divisors (164300740).

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

131440520 is a wasteful number, since it uses less digits than its factorization.

131440520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286024 (or 3286020 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 131440520 is about 11464.7511966026. The cubic root of 131440520 is about 508.4439564555.

Adding to 131440520 its reverse (25044131), we get a palindrome (156484651).

The spelling of 131440520 in words is "one hundred thirty-one million, four hundred forty thousand, five hundred twenty".