131421811 has 2 divisors, whose sum is σ = 131421812. Its totient is φ = 131421810.

The previous prime is 131421809. The next prime is 131421869. The reversal of 131421811 is 118124131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131421811 - 2¹ = 131421809 is a prime.

Together with 131421809, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (131421911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65710905 + 65710906.

It is an arithmetic number, because the mean of its divisors is an integer number (65710906).

Almost surely, 2^131421811 is an apocalyptic number.

131421811 is a deficient number, since it is larger than the sum of its proper divisors (1).

131421811 is an equidigital number, since it uses as much as digits as its factorization.

131421811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 22.

The square root of 131421811 is about 11463.9352318477. The cubic root of 131421811 is about 508.4198316540.

Adding to 131421811 its reverse (118124131), we get a palindrome (249545942).

The spelling of 131421811 in words is "one hundred thirty-one million, four hundred twenty-one thousand, eight hundred eleven".