81319469 has 20 divisors (see below), whose sum is σ = 103524960. Its totient is φ = 63345240.

The previous prime is 81319457. The next prime is 81319531. The reversal of 81319469 is 96491318.

It is not a de Polignac number, because 81319469 - 2⁴ = 81319453 is a prime.

It is a super-2 number, since 2×81319469² = 13225712076883922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81319409) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24872 + ... + 27950.

It is an arithmetic number, because the mean of its divisors is an integer number (5176248).

Almost surely, 2^81319469 is an apocalyptic number.

It is an amenable number.

81319469 is a deficient number, since it is larger than the sum of its proper divisors (22205491).

81319469 is an equidigital number, since it uses as much as digits as its factorization.

81319469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3118 (or 3097 counting only the distinct ones).

The product of its digits is 46656, while the sum is 41.

The square root of 81319469 is about 9017.7308121278. The cubic root of 81319469 is about 433.2429570235.

The spelling of 81319469 in words is "eighty-one million, three hundred nineteen thousand, four hundred sixty-nine".