81488517 has 32 divisors (see below), whose sum is σ = 125024256. Its totient is φ = 46728000.

The previous prime is 81488479. The next prime is 81488551. The reversal of 81488517 is 71588418.

It is not a de Polignac number, because 81488517 - 2⁶ = 81488453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81488557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76128 + ... + 77190.

It is an arithmetic number, because the mean of its divisors is an integer number (3907008).

Almost surely, 2^81488517 is an apocalyptic number.

It is an amenable number.

81488517 is a deficient number, since it is larger than the sum of its proper divisors (43535739).

81488517 is a wasteful number, since it uses less digits than its factorization.

81488517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201.

The product of its digits is 71680, while the sum is 42.

The square root of 81488517 is about 9027.0990356814. The cubic root of 81488517 is about 433.5429596545.

Subtracting from 81488517 its reverse (71588418), we obtain a palindrome (9900099).

The spelling of 81488517 in words is "eighty-one million, four hundred eighty-eight thousand, five hundred seventeen".