81163267 has 4 divisors (see below), whose sum is σ = 81881640. Its totient is φ = 80444896.

The previous prime is 81163259. The next prime is 81163289. The reversal of 81163267 is 76236118.

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 81163267 - 2³ = 81163259 is a prime.

It is a super-2 number, since 2×81163267² = 13174951820226578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81163207) 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, 359017 + ... + 359242.

It is an arithmetic number, because the mean of its divisors is an integer number (20470410).

Almost surely, 2^81163267 is an apocalyptic number.

81163267 is a deficient number, since it is larger than the sum of its proper divisors (718373).

81163267 is a wasteful number, since it uses less digits than its factorization.

81163267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718372.

The product of its digits is 12096, while the sum is 34.

The square root of 81163267 is about 9009.0658228254. The cubic root of 81163267 is about 432.9653818683.

The spelling of 81163267 in words is "eighty-one million, one hundred sixty-three thousand, two hundred sixty-seven".