81350985 has 8 divisors (see below), whose sum is σ = 130161600. Its totient is φ = 43387184.

The previous prime is 81350959. The next prime is 81351007. The reversal of 81350985 is 58905318.

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 81350985 - 2⁶ = 81350921 is a prime.

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, 2711685 + ... + 2711714.

It is an arithmetic number, because the mean of its divisors is an integer number (16270200).

Almost surely, 2^81350985 is an apocalyptic number.

It is an amenable number.

81350985 is a deficient number, since it is larger than the sum of its proper divisors (48810615).

81350985 is a wasteful number, since it uses less digits than its factorization.

81350985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5423407.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 81350985 is about 9019.4780891136. The cubic root of 81350985 is about 433.2989187002.

The spelling of 81350985 in words is "eighty-one million, three hundred fifty thousand, nine hundred eighty-five".