131341781 has 2 divisors, whose sum is σ = 131341782. Its totient is φ = 131341780.

The previous prime is 131341759. The next prime is 131341817. The reversal of 131341781 is 187143131.

Together with next prime (131341817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73444900 + 57896881 = 8570^2 + 7609^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131341781 is a prime.

It is a super-2 number, since 2×131341781² = 34501326872503922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131341741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65670890 + 65670891.

It is an arithmetic number, because the mean of its divisors is an integer number (65670891).

Almost surely, 2^131341781 is an apocalyptic number.

It is an amenable number.

131341781 is a deficient number, since it is larger than the sum of its proper divisors (1).

131341781 is an equidigital number, since it uses as much as digits as its factorization.

131341781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 131341781 is about 11460.4441885993. Note that the first 3 decimals coincide. The cubic root of 131341781 is about 508.3166090589.

The spelling of 131341781 in words is "one hundred thirty-one million, three hundred forty-one thousand, seven hundred eighty-one".