81041385 has 8 divisors (see below), whose sum is σ = 129666240. Its totient is φ = 43222064.

The previous prime is 81041377. The next prime is 81041393. The reversal of 81041385 is 58314018.

It is an interprime number because it is at equal distance from previous prime (81041377) and next prime (81041393).

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 81041385 - 2³ = 81041377 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, 2701365 + ... + 2701394.

It is an arithmetic number, because the mean of its divisors is an integer number (16208280).

Almost surely, 2^81041385 is an apocalyptic number.

It is an amenable number.

81041385 is a deficient number, since it is larger than the sum of its proper divisors (48624855).

81041385 is a wasteful number, since it uses less digits than its factorization.

81041385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5402767.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 81041385 is about 9002.2988730657. The cubic root of 81041385 is about 432.7485468157.

It can be divided in two parts, 810 and 41385, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 81041385 in words is "eighty-one million, forty-one thousand, three hundred eighty-five".