81293269 has 8 divisors (see below), whose sum is σ = 86341248. Its totient is φ = 76274880.

The previous prime is 81293257. The next prime is 81293281. The reversal of 81293269 is 96239218.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81293257) and next prime (81293281).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81293269 - 2⁵ = 81293237 is a prime.

It is a super-2 number, since 2×81293269² = 13217191169412722, 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 (81293369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1597 + ... + 12850.

It is an arithmetic number, because the mean of its divisors is an integer number (10792656).

Almost surely, 2^81293269 is an apocalyptic number.

It is an amenable number.

81293269 is a deficient number, since it is larger than the sum of its proper divisors (5047979).

81293269 is a wasteful number, since it uses less digits than its factorization.

81293269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14795.

The product of its digits is 46656, while the sum is 40.

The square root of 81293269 is about 9016.2780014815. The cubic root of 81293269 is about 433.1964237440.

The spelling of 81293269 in words is "eighty-one million, two hundred ninety-three thousand, two hundred sixty-nine".