131144240 has 40 divisors (see below), whose sum is σ = 312355008. Its totient is φ = 51176960.

The previous prime is 131144201. The next prime is 131144261. The reversal of 131144240 is 42441131.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 16712 + ... + 23271.

Almost surely, 2^131144240 is an apocalyptic number.

131144240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131144240 is an abundant number, since it is smaller than the sum of its proper divisors (181210768).

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

131144240 is a wasteful number, since it uses less digits than its factorization.

131144240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40037 (or 40031 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 131144240 is about 11451.8225623697. The cubic root of 131144240 is about 508.0616413100.

Adding to 131144240 its reverse (42441131), we get a palindrome (173585371).

The spelling of 131144240 in words is "one hundred thirty-one million, one hundred forty-four thousand, two hundred forty".