131444420 has 24 divisors (see below), whose sum is σ = 276725400. Its totient is φ = 52445952.

The previous prime is 131444407. The next prime is 131444441. The reversal of 131444420 is 24444131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23658496 + 107785924 = 4864^2 + 10382^2 .

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, 146 + ... + 16214.

It is an arithmetic number, because the mean of its divisors is an integer number (11530225).

Almost surely, 2^131444420 is an apocalyptic number.

131444420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131444420 is an abundant number, since it is smaller than the sum of its proper divisors (145280980).

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

131444420 is a wasteful number, since it uses less digits than its factorization.

131444420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16487 (or 16485 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 131444420 is about 11464.9212818929. The cubic root of 131444420 is about 508.4489851225.

Adding to 131444420 its reverse (24444131), we get a palindrome (155888551).

The spelling of 131444420 in words is "one hundred thirty-one million, four hundred forty-four thousand, four hundred twenty".