81850601 has 8 divisors (see below), whose sum is σ = 93604224. Its totient is φ = 70112160.

The previous prime is 81850591. The next prime is 81850609. The reversal of 81850601 is 10605818.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81850601 is a prime.

It is a super-2 number, since 2×81850601² = 13399041768122402, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81850609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12356 + ... + 17786.

It is an arithmetic number, because the mean of its divisors is an integer number (11700528).

Almost surely, 2^81850601 is an apocalyptic number.

It is an amenable number.

81850601 is a deficient number, since it is larger than the sum of its proper divisors (11753623).

81850601 is a wasteful number, since it uses less digits than its factorization.

81850601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7591.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 81850601 is about 9047.1321975530. The cubic root of 81850601 is about 434.1841421654.

The spelling of 81850601 in words is "eighty-one million, eight hundred fifty thousand, six hundred one".