81208259 has 8 divisors (see below), whose sum is σ = 89123328. Its totient is φ = 73381960.

The previous prime is 81208247. The next prime is 81208271. The reversal of 81208259 is 95280218.

It is an interprime number because it is at equal distance from previous prime (81208247) and next prime (81208271).

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 81208259 - 2¹² = 81204163 is a prime.

It is a super-2 number, since 2×81208259² = 13189562659622162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81208459) 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, 20267 + ... + 23940.

It is an arithmetic number, because the mean of its divisors is an integer number (11140416).

Almost surely, 2^81208259 is an apocalyptic number.

81208259 is a deficient number, since it is larger than the sum of its proper divisors (7915069).

81208259 is a wasteful number, since it uses less digits than its factorization.

81208259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44385.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 81208259 is about 9011.5625171221. The cubic root of 81208259 is about 433.0453703523.

The spelling of 81208259 in words is "eighty-one million, two hundred eight thousand, two hundred fifty-nine".