81459506 has 8 divisors (see below), whose sum is σ = 126130944. Its totient is φ = 39415860.

The previous prime is 81459503. The next prime is 81459527. The reversal of 81459506 is 60595418.

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

It is a super-2 number, since 2×81459506² = 13271302235528072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81459506.

It is not an unprimeable number, because it can be changed into a prime (81459503) 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, 656870 + ... + 656993.

It is an arithmetic number, because the mean of its divisors is an integer number (15766368).

Almost surely, 2^81459506 is an apocalyptic number.

81459506 is a deficient number, since it is larger than the sum of its proper divisors (44671438).

81459506 is a wasteful number, since it uses less digits than its factorization.

81459506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313896.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 81459506 is about 9025.4920087494. The cubic root of 81459506 is about 433.4915045205.

The spelling of 81459506 in words is "eighty-one million, four hundred fifty-nine thousand, five hundred six".