81412985 has 8 divisors (see below), whose sum is σ = 101943360. Its totient is φ = 62298544.

The previous prime is 81412937. The next prime is 81412993. The reversal of 81412985 is 58921418.

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 81412985 - 2⁸ = 81412729 is a prime.

It is a super-2 number, since 2×81412985² = 13256148253220450, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353855 + ... + 354084.

It is an arithmetic number, because the mean of its divisors is an integer number (12742920).

Almost surely, 2^81412985 is an apocalyptic number.

It is an amenable number.

81412985 is a deficient number, since it is larger than the sum of its proper divisors (20530375).

81412985 is a wasteful number, since it uses less digits than its factorization.

81412985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707967.

The product of its digits is 23040, while the sum is 38.

The square root of 81412985 is about 9022.9144404677. The cubic root of 81412985 is about 433.4089674029.

The spelling of 81412985 in words is "eighty-one million, four hundred twelve thousand, nine hundred eighty-five".