131255440 has 40 divisors (see below), whose sum is σ = 306786168. Its totient is φ = 52224000.

The previous prime is 131255429. The next prime is 131255491. The reversal of 131255440 is 44552131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 473344 + 130782096 = 688^2 + 11436^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11190 + ... + 19690.

Almost surely, 2^131255440 is an apocalyptic number.

131255440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131255440 is an abundant number, since it is smaller than the sum of its proper divisors (175530728).

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

131255440 is a wasteful number, since it uses less digits than its factorization.

131255440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8707 (or 8701 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 131255440 is about 11456.6766559941. The cubic root of 131255440 is about 508.2051995119.

The spelling of 131255440 in words is "one hundred thirty-one million, two hundred fifty-five thousand, four hundred forty".