81339267 has 8 divisors (see below), whose sum is σ = 108649296. Its totient is φ = 54127712.

The previous prime is 81339221. The next prime is 81339277. The reversal of 81339267 is 76293318.

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 81339267 - 2¹² = 81335171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81339217) 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, 22668 + ... + 26009.

It is an arithmetic number, because the mean of its divisors is an integer number (13581162).

Almost surely, 2^81339267 is an apocalyptic number.

81339267 is a deficient number, since it is larger than the sum of its proper divisors (27310029).

81339267 is a wasteful number, since it uses less digits than its factorization.

81339267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49237.

The product of its digits is 54432, while the sum is 39.

The square root of 81339267 is about 9018.8284715921. The cubic root of 81339267 is about 433.2781132134.

The spelling of 81339267 in words is "eighty-one million, three hundred thirty-nine thousand, two hundred sixty-seven".