131640520 has 64 divisors (see below), whose sum is σ = 342144000. Its totient is φ = 45050880.

The previous prime is 131640517. The next prime is 131640521. The reversal of 131640520 is 25046131.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 131640491 and 131640500.

It is not an unprimeable number, because it can be changed into a prime (131640521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1320 + ... + 16279.

It is an arithmetic number, because the mean of its divisors is an integer number (5346000).

Almost surely, 2^131640520 is an apocalyptic number.

131640520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131640520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171072000).

131640520 is an abundant number, since it is smaller than the sum of its proper divisors (210503480).

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

131640520 is a wasteful number, since it uses less digits than its factorization.

131640520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17638 (or 17634 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 131640520 is about 11473.4702684062. The cubic root of 131640520 is about 508.7017086774.

Adding to 131640520 its reverse (25046131), we get a palindrome (156686651).

The spelling of 131640520 in words is "one hundred thirty-one million, six hundred forty thousand, five hundred twenty".