81034519 has 4 divisors (see below), whose sum is σ = 81054640. Its totient is φ = 81014400.

The previous prime is 81034511. The next prime is 81034523. The reversal of 81034519 is 91543018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81034519 - 2³ = 81034511 is a prime.

It is a super-2 number, since 2×81034519² = 13133186539122722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81034511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1707 + ... + 12844.

It is an arithmetic number, because the mean of its divisors is an integer number (20263660).

Almost surely, 2^81034519 is an apocalyptic number.

81034519 is a deficient number, since it is larger than the sum of its proper divisors (20121).

81034519 is a wasteful number, since it uses less digits than its factorization.

81034519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20120.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 81034519 is about 9001.9175179514. The cubic root of 81034519 is about 432.7363253422.

The spelling of 81034519 in words is "eighty-one million, thirty-four thousand, five hundred nineteen".