131513240 has 32 divisors (see below), whose sum is σ = 303125760. Its totient is φ = 51321600.

The previous prime is 131513237. The next prime is 131513257. The reversal of 131513240 is 42315131.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38456 + ... + 41735.

It is an arithmetic number, because the mean of its divisors is an integer number (9472680).

Almost surely, 2^131513240 is an apocalyptic number.

131513240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131513240 is an abundant number, since it is smaller than the sum of its proper divisors (171612520).

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

131513240 is a wasteful number, since it uses less digits than its factorization.

131513240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80243 (or 80239 counting only the distinct ones).

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

The square root of 131513240 is about 11467.9222180829. The cubic root of 131513240 is about 508.5377053946.

Adding to 131513240 its reverse (42315131), we get a palindrome (173828371).

The spelling of 131513240 in words is "one hundred thirty-one million, five hundred thirteen thousand, two hundred forty".