81727513 has 16 divisors (see below), whose sum is σ = 94887936. Its totient is φ = 68947920.

The previous prime is 81727511. The next prime is 81727523. The reversal of 81727513 is 31572718.

It is a cyclic number.

It is not a de Polignac number, because 81727513 - 2¹ = 81727511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81727511) 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, 189408 + ... + 189838.

It is an arithmetic number, because the mean of its divisors is an integer number (5930496).

Almost surely, 2^81727513 is an apocalyptic number.

It is an amenable number.

81727513 is a deficient number, since it is larger than the sum of its proper divisors (13160423).

81727513 is a wasteful number, since it uses less digits than its factorization.

81727513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804.

The product of its digits is 11760, while the sum is 34.

The square root of 81727513 is about 9040.3270405445. The cubic root of 81727513 is about 433.9663890526.

The spelling of 81727513 in words is "eighty-one million, seven hundred twenty-seven thousand, five hundred thirteen".