131044640 has 24 divisors (see below), whose sum is σ = 309593340. Its totient is φ = 52417792.

The previous prime is 131044621. The next prime is 131044643. The reversal of 131044640 is 46440131.

It can be written as a sum of positive squares in 2 ways, for example, as 118113424 + 12931216 = 10868^2 + 3596^2 .

It is not an unprimeable number, because it can be changed into a prime (131044643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409355 + ... + 409674.

Almost surely, 2^131044640 is an apocalyptic number.

131044640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131044640 is an abundant number, since it is smaller than the sum of its proper divisors (178548700).

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

131044640 is an equidigital number, since it uses as much as digits as its factorization.

131044640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819044 (or 819036 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 131044640 is about 11447.4730836111. The cubic root of 131044640 is about 507.9329896937.

Adding to 131044640 its reverse (46440131), we get a palindrome (177484771).

The spelling of 131044640 in words is "one hundred thirty-one million, forty-four thousand, six hundred forty".