131405081 has 2 divisors, whose sum is σ = 131405082. Its totient is φ = 131405080.

The previous prime is 131405077. The next prime is 131405089. The reversal of 131405081 is 180504131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112699456 + 18705625 = 10616^2 + 4325^2 .

It is an emirp because it is prime and its reverse (180504131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131405081 - 2² = 131405077 is a prime.

It is a super-2 number, since 2×131405081² = 34534590625233122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131405089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65702540 + 65702541.

It is an arithmetic number, because the mean of its divisors is an integer number (65702541).

Almost surely, 2^131405081 is an apocalyptic number.

It is an amenable number.

131405081 is a deficient number, since it is larger than the sum of its proper divisors (1).

131405081 is an equidigital number, since it uses as much as digits as its factorization.

131405081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 131405081 is about 11463.2055289958. The cubic root of 131405081 is about 508.3982567858.

It can be divided in two parts, 1314050 and 81, that added together give a palindrome (1314131).

The spelling of 131405081 in words is "one hundred thirty-one million, four hundred five thousand, eighty-one".