81600897 has 32 divisors (see below), whose sum is σ = 129310720. Its totient is φ = 44789760.

The previous prime is 81600889. The next prime is 81600931. The reversal of 81600897 is 79800618.

It is not a de Polignac number, because 81600897 - 2³ = 81600889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81600847) 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 in 31 ways as a sum of consecutive naturals, for example, 105729 + ... + 106497.

It is an arithmetic number, because the mean of its divisors is an integer number (4040960).

Almost surely, 2^81600897 is an apocalyptic number.

It is an amenable number.

81600897 is a deficient number, since it is larger than the sum of its proper divisors (47709823).

81600897 is a wasteful number, since it uses less digits than its factorization.

81600897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 81600897 is about 9033.3214821570. The cubic root of 81600897 is about 433.7421663632.

The spelling of 81600897 in words is "eighty-one million, six hundred thousand, eight hundred ninety-seven".