81070097 has 2 divisors, whose sum is σ = 81070098. Its totient is φ = 81070096.

The previous prime is 81070063. The next prime is 81070111. The reversal of 81070097 is 79007018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77986561 + 3083536 = 8831^2 + 1756^2 .

It is a cyclic number.

It is not a de Polignac number, because 81070097 - 2⁸ = 81069841 is a prime.

It is not a weakly prime, because it can be changed into another prime (81070027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40535048 + 40535049.

It is an arithmetic number, because the mean of its divisors is an integer number (40535049).

Almost surely, 2^81070097 is an apocalyptic number.

It is an amenable number.

81070097 is a deficient number, since it is larger than the sum of its proper divisors (1).

81070097 is an equidigital number, since it uses as much as digits as its factorization.

81070097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 81070097 is about 9003.8934356199. The cubic root of 81070097 is about 432.7996466713.

It can be divided in two parts, 810 and 70097, that added together give a palindrome (70907).

The spelling of 81070097 in words is "eighty-one million, seventy thousand, ninety-seven".