131481281 has 4 divisors (see below), whose sum is σ = 139215492. Its totient is φ = 123747072.

The previous prime is 131481277. The next prime is 131481289. The reversal of 131481281 is 182184131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182184131 = 431 ⋅422701.

It can be written as a sum of positive squares in 2 ways, for example, as 38551681 + 92929600 = 6209^2 + 9640^2 .

It is a cyclic number.

It is not a de Polignac number, because 131481281 - 2² = 131481277 is a prime.

It is a super-2 number, since 2×131481281² = 34574654506801922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131481289) 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, 3867080 + ... + 3867113.

It is an arithmetic number, because the mean of its divisors is an integer number (34803873).

Almost surely, 2^131481281 is an apocalyptic number.

It is an amenable number.

131481281 is a deficient number, since it is larger than the sum of its proper divisors (7734211).

131481281 is an equidigital number, since it uses as much as digits as its factorization.

131481281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7734210.

The product of its digits is 1536, while the sum is 29.

The square root of 131481281 is about 11466.5287249455. The cubic root of 131481281 is about 508.4965088499.

The spelling of 131481281 in words is "one hundred thirty-one million, four hundred eighty-one thousand, two hundred eighty-one".