81037897 has 2 divisors, whose sum is σ = 81037898. Its totient is φ = 81037896.

The previous prime is 81037883. The next prime is 81037981. The reversal of 81037897 is 79873018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77721856 + 3316041 = 8816^2 + 1821^2 .

It is a cyclic number.

It is not a de Polignac number, because 81037897 - 2¹⁵ = 81005129 is a prime.

It is not a weakly prime, because it can be changed into another prime (81037867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40518948 + 40518949.

It is an arithmetic number, because the mean of its divisors is an integer number (40518949).

Almost surely, 2^81037897 is an apocalyptic number.

It is an amenable number.

81037897 is a deficient number, since it is larger than the sum of its proper divisors (1).

81037897 is an equidigital number, since it uses as much as digits as its factorization.

81037897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 81037897 is about 9002.1051426875. The cubic root of 81037897 is about 432.7423382653.

The spelling of 81037897 in words is "eighty-one million, thirty-seven thousand, eight hundred ninety-seven".