81488519 has 6 divisors (see below), whose sum is σ = 94792824. Its totient is φ = 69847260.

The previous prime is 81488479. The next prime is 81488551. The reversal of 81488519 is 91588418.

It is not a de Polignac number, because 81488519 - 2²⁴ = 64711303 is a prime.

It is a super-2 number, since 2×81488519² = 13280757457626722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81488519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81488219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 831467 + ... + 831564.

It is an arithmetic number, because the mean of its divisors is an integer number (15798804).

Almost surely, 2^81488519 is an apocalyptic number.

81488519 is a deficient number, since it is larger than the sum of its proper divisors (13304305).

81488519 is a wasteful number, since it uses less digits than its factorization.

81488519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663045 (or 1663038 counting only the distinct ones).

The product of its digits is 92160, while the sum is 44.

The square root of 81488519 is about 9027.0991464590. The cubic root of 81488519 is about 433.5429632014.

The spelling of 81488519 in words is "eighty-one million, four hundred eighty-eight thousand, five hundred nineteen".