81347099 has 8 divisors (see below), whose sum is σ = 84606192. Its totient is φ = 78150240.

The previous prime is 81347093. The next prime is 81347107. The reversal of 81347099 is 99074318.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81347099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81347093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12884 + ... + 18129.

It is an arithmetic number, because the mean of its divisors is an integer number (10575774).

Almost surely, 2^81347099 is an apocalyptic number.

81347099 is a deficient number, since it is larger than the sum of its proper divisors (3259093).

81347099 is a wasteful number, since it uses less digits than its factorization.

81347099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31117.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 81347099 is about 9019.2626638767. The cubic root of 81347099 is about 433.2920192697.

The spelling of 81347099 in words is "eighty-one million, three hundred forty-seven thousand, ninety-nine".