131503540 has 48 divisors (see below), whose sum is σ = 319439232. Its totient is φ = 44539776.

The previous prime is 131503481. The next prime is 131503553. The reversal of 131503540 is 45305131.

It is a happy number.

It is a congruent number.

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, 5962 + ... + 17278.

It is an arithmetic number, because the mean of its divisors is an integer number (6654984).

Almost surely, 2^131503540 is an apocalyptic number.

131503540 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 131503540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159719616).

131503540 is an abundant number, since it is smaller than the sum of its proper divisors (187935692).

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

131503540 is a wasteful number, since it uses less digits than its factorization.

131503540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11416 (or 11414 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 131503540 is about 11467.4992914759. The cubic root of 131503540 is about 508.5252023771.

Adding to 131503540 its reverse (45305131), we get a palindrome (176808671).

The spelling of 131503540 in words is "one hundred thirty-one million, five hundred three thousand, five hundred forty".