81332259 has 8 divisors (see below), whose sum is σ = 108751632. Its totient is φ = 54067200.

The previous prime is 81332257. The next prime is 81332297. The reversal of 81332259 is 95223318.

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

It is not a de Polignac number, because 81332259 - 2¹ = 81332257 is a prime.

It is a super-2 number, since 2×81332259² = 13229872708086162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81332257) 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, 37342 + ... + 39459.

It is an arithmetic number, because the mean of its divisors is an integer number (13593954).

Almost surely, 2^81332259 is an apocalyptic number.

81332259 is a deficient number, since it is larger than the sum of its proper divisors (27419373).

81332259 is a wasteful number, since it uses less digits than its factorization.

81332259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77157.

The product of its digits is 12960, while the sum is 33.

The square root of 81332259 is about 9018.4399426952. The cubic root of 81332259 is about 433.2656694482.

The spelling of 81332259 in words is "eighty-one million, three hundred thirty-two thousand, two hundred fifty-nine".