81096729 has 32 divisors (see below), whose sum is σ = 127733760. Its totient is φ = 44803200.

The previous prime is 81096721. The next prime is 81096737. The reversal of 81096729 is 92769018.

It is an interprime number because it is at equal distance from previous prime (81096721) and next prime (81096737).

It is not a de Polignac number, because 81096729 - 2³ = 81096721 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (81096721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112432 + ... + 113150.

It is an arithmetic number, because the mean of its divisors is an integer number (3991680).

Almost surely, 2^81096729 is an apocalyptic number.

It is an amenable number.

81096729 is a deficient number, since it is larger than the sum of its proper divisors (46637031).

81096729 is a wasteful number, since it uses less digits than its factorization.

81096729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 81096729 is about 9005.3722299525. The cubic root of 81096729 is about 432.8470338860.

The spelling of 81096729 in words is "eighty-one million, ninety-six thousand, seven hundred twenty-nine".