131445540 has 36 divisors (see below), whose sum is σ = 398718684. Its totient is φ = 35052096.

The previous prime is 131445473. The next prime is 131445563. The reversal of 131445540 is 45544131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 29354724 + 102090816 = 5418^2 + 10104^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 364947 + ... + 365306.

It is an arithmetic number, because the mean of its divisors is an integer number (11075519).

Almost surely, 2^131445540 is an apocalyptic number.

131445540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131445540 is an abundant number, since it is smaller than the sum of its proper divisors (267273144).

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

131445540 is a wasteful number, since it uses less digits than its factorization.

131445540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730268 (or 730263 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 131445540 is about 11464.9701264330. The cubic root of 131445540 is about 508.4504292341.

Adding to 131445540 its reverse (45544131), we get a palindrome (176989671).

The spelling of 131445540 in words is "one hundred thirty-one million, four hundred forty-five thousand, five hundred forty".