81041607 has 16 divisors (see below), whose sum is σ = 121709280. Its totient is φ = 53286336.

The previous prime is 81041603. The next prime is 81041617. The reversal of 81041607 is 70614018.

It is a happy number.

81041607 is a `hidden beast` number, since 8 + 10 + 41 + 607 = 666.

It is not a de Polignac number, because 81041607 - 2² = 81041603 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81041603) 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 15 ways as a sum of consecutive naturals, for example, 18588 + ... + 22529.

It is an arithmetic number, because the mean of its divisors is an integer number (7606830).

Almost surely, 2^81041607 is an apocalyptic number.

81041607 is a deficient number, since it is larger than the sum of its proper divisors (40667673).

81041607 is a wasteful number, since it uses less digits than its factorization.

81041607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41199 (or 41193 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 81041607 is about 9002.3112032411. The cubic root of 81041607 is about 432.7489419640.

The spelling of 81041607 in words is "eighty-one million, forty-one thousand, six hundred seven".