81560577 has 16 divisors (see below), whose sum is σ = 131594112. Its totient is φ = 43864320.

The previous prime is 81560569. The next prime is 81560623. The reversal of 81560577 is 77506518.

It is not a de Polignac number, because 81560577 - 2³ = 81560569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81560777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113874 + ... + 114587.

It is an arithmetic number, because the mean of its divisors is an integer number (8224632).

Almost surely, 2^81560577 is an apocalyptic number.

It is an amenable number.

81560577 is a deficient number, since it is larger than the sum of its proper divisors (50033535).

81560577 is a wasteful number, since it uses less digits than its factorization.

81560577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228488.

The product of its (nonzero) digits is 58800, while the sum is 39.

The square root of 81560577 is about 9031.0894691615. The cubic root of 81560577 is about 433.6707154928.

The spelling of 81560577 in words is "eighty-one million, five hundred sixty thousand, five hundred seventy-seven".