81426937 has 2 divisors, whose sum is σ = 81426938. Its totient is φ = 81426936.

The previous prime is 81426931. The next prime is 81426971. The reversal of 81426937 is 73962418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54997056 + 26429881 = 7416^2 + 5141^2 .

It is a cyclic number.

It is not a de Polignac number, because 81426937 - 2¹⁵ = 81394169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81426937.

It is not a weakly prime, because it can be changed into another prime (81426931) 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, 40713468 + 40713469.

It is an arithmetic number, because the mean of its divisors is an integer number (40713469).

Almost surely, 2^81426937 is an apocalyptic number.

It is an amenable number.

81426937 is a deficient number, since it is larger than the sum of its proper divisors (1).

81426937 is an equidigital number, since it uses as much as digits as its factorization.

81426937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 81426937 is about 9023.6875499986. The cubic root of 81426937 is about 433.4337242093.

The spelling of 81426937 in words is "eighty-one million, four hundred twenty-six thousand, nine hundred thirty-seven".