81160765 has 8 divisors (see below), whose sum is σ = 111306240. Its totient is φ = 55653072.

The previous prime is 81160753. The next prime is 81160777. The reversal of 81160765 is 56706118.

It is an interprime number because it is at equal distance from previous prime (81160753) and next prime (81160777).

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 81160765 - 2⁹ = 81160253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81160765.

It is a congruent number.

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, 1159405 + ... + 1159474.

It is an arithmetic number, because the mean of its divisors is an integer number (13913280).

Almost surely, 2^81160765 is an apocalyptic number.

It is an amenable number.

81160765 is a deficient number, since it is larger than the sum of its proper divisors (30145475).

81160765 is a wasteful number, since it uses less digits than its factorization.

81160765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318891.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 81160765 is about 9008.9269616309. The cubic root of 81160765 is about 432.9609328502.

The spelling of 81160765 in words is "eighty-one million, one hundred sixty thousand, seven hundred sixty-five".