131321540 has 48 divisors (see below), whose sum is σ = 331766400. Its totient is φ = 42653952.

The previous prime is 131321537. The next prime is 131321569. The reversal of 131321540 is 45123131.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22025 + ... + 27344.

It is an arithmetic number, because the mean of its divisors is an integer number (6911800).

Almost surely, 2^131321540 is an apocalyptic number.

131321540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131321540 is an abundant number, since it is smaller than the sum of its proper divisors (200444860).

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

131321540 is a wasteful number, since it uses less digits than its factorization.

131321540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49404 (or 49402 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 131321540 is about 11459.5610736188. The cubic root of 131321540 is about 508.2904955988.

Adding to 131321540 its reverse (45123131), we get a palindrome (176444671).

The spelling of 131321540 in words is "one hundred thirty-one million, three hundred twenty-one thousand, five hundred forty".