131440581 has 6 divisors (see below), whose sum is σ = 189858630. Its totient is φ = 87627048.

The previous prime is 131440579. The next prime is 131440591. The reversal of 131440581 is 185044131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 79816356 + 51624225 = 8934^2 + 7185^2 .

It is not a de Polignac number, because 131440581 - 2¹ = 131440579 is a prime.

It is a super-2 number, since 2×131440581² = 34553252667235122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131440501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7302246 + ... + 7302263.

It is an arithmetic number, because the mean of its divisors is an integer number (31643105).

Almost surely, 2^131440581 is an apocalyptic number.

It is an amenable number.

131440581 is a deficient number, since it is larger than the sum of its proper divisors (58418049).

131440581 is a wasteful number, since it uses less digits than its factorization.

131440581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14604515 (or 14604512 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 131440581 is about 11464.7538569304. The cubic root of 131440581 is about 508.4440351097. Note that the first 3 decimals are identical.

The spelling of 131440581 in words is "one hundred thirty-one million, four hundred forty thousand, five hundred eighty-one".