81560697 has 8 divisors (see below), whose sum is σ = 110058144. Its totient is φ = 53718528.

The previous prime is 81560671. The next prime is 81560701. The reversal of 81560697 is 79606518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81560697 - 2⁷ = 81560569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81560657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163528 + ... + 164025.

It is an arithmetic number, because the mean of its divisors is an integer number (13757268).

Almost surely, 2^81560697 is an apocalyptic number.

It is an amenable number.

81560697 is a deficient number, since it is larger than the sum of its proper divisors (28497447).

81560697 is a wasteful number, since it uses less digits than its factorization.

81560697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327639.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 81560697 is about 9031.0961128758. The cubic root of 81560697 is about 433.6709281791.

The spelling of 81560697 in words is "eighty-one million, five hundred sixty thousand, six hundred ninety-seven".