81119419 has 4 divisors (see below), whose sum is σ = 81544320. Its totient is φ = 80694520.

The previous prime is 81119377. The next prime is 81119431. The reversal of 81119419 is 91491118.

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 81119419 - 2¹¹ = 81117371 is a prime.

It is a super-2 number, since 2×81119419² = 13160720277795122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81119449) 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, 212164 + ... + 212545.

It is an arithmetic number, because the mean of its divisors is an integer number (20386080).

Almost surely, 2^81119419 is an apocalyptic number.

81119419 is a deficient number, since it is larger than the sum of its proper divisors (424901).

81119419 is a wasteful number, since it uses less digits than its factorization.

81119419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424900.

The product of its digits is 2592, while the sum is 34.

The square root of 81119419 is about 9006.6319454056. The cubic root of 81119419 is about 432.8873987832.

The spelling of 81119419 in words is "eighty-one million, one hundred nineteen thousand, four hundred nineteen".