131340821 has 2 divisors, whose sum is σ = 131340822. Its totient is φ = 131340820.

The previous prime is 131340799. The next prime is 131340823. The reversal of 131340821 is 128043131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79299025 + 52041796 = 8905^2 + 7214^2 .

It is a cyclic number.

It is not a de Polignac number, because 131340821 - 2²² = 127146517 is a prime.

It is a super-2 number, since 2×131340821² = 34500822521908082, which contains 22 as substring.

Together with 131340823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131340823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65670410 + 65670411.

It is an arithmetic number, because the mean of its divisors is an integer number (65670411).

Almost surely, 2^131340821 is an apocalyptic number.

It is an amenable number.

131340821 is a deficient number, since it is larger than the sum of its proper divisors (1).

131340821 is an equidigital number, since it uses as much as digits as its factorization.

131340821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 131340821 is about 11460.4023053294. The cubic root of 131340821 is about 508.3153705976.

Adding to 131340821 its reverse (128043131), we get a palindrome (259383952).

The spelling of 131340821 in words is "one hundred thirty-one million, three hundred forty thousand, eight hundred twenty-one".