81097419 has 32 divisors (see below), whose sum is σ = 120121344. Its totient is φ = 48355200.

The previous prime is 81097411. The next prime is 81097433. The reversal of 81097419 is 91479018.

It is a happy number.

It is not a de Polignac number, because 81097419 - 2³ = 81097411 is a prime.

It is a super-2 number, since 2×81097419² = 13153582736923122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (81097411) 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, 276637 + ... + 276929.

It is an arithmetic number, because the mean of its divisors is an integer number (3753792).

Almost surely, 2^81097419 is an apocalyptic number.

81097419 is a deficient number, since it is larger than the sum of its proper divisors (39023925).

81097419 is a wasteful number, since it uses less digits than its factorization.

81097419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 81097419 is about 9005.4105403363. The cubic root of 81097419 is about 432.8482614884.

The spelling of 81097419 in words is "eighty-one million, ninety-seven thousand, four hundred nineteen".