131311240 has 32 divisors (see below), whose sum is σ = 296132760. Its totient is φ = 52403200.

The previous prime is 131311199. The next prime is 131311241. The reversal of 131311240 is 42113131.

It can be written as a sum of positive squares in 4 ways, for example, as 54257956 + 77053284 = 7366^2 + 8778^2 .

It is not an unprimeable number, because it can be changed into a prime (131311241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14880 + ... + 22000.

Almost surely, 2^131311240 is an apocalyptic number.

131311240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131311240 is an abundant number, since it is smaller than the sum of its proper divisors (164821520).

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

131311240 is a wasteful number, since it uses less digits than its factorization.

131311240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7593 (or 7589 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 131311240 is about 11459.1116584140. Note that the first 3 decimals coincide. The cubic root of 131311240 is about 508.2772062608.

Adding to 131311240 its reverse (42113131), we get a palindrome (173424371).

The spelling of 131311240 in words is "one hundred thirty-one million, three hundred eleven thousand, two hundred forty".