81343099 has 4 divisors (see below), whose sum is σ = 81362560. Its totient is φ = 81323640.

The previous prime is 81343091. The next prime is 81343127. The reversal of 81343099 is 99034318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81343099 - 2³ = 81343091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81343091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 612 + ... + 12769.

It is an arithmetic number, because the mean of its divisors is an integer number (20340640).

Almost surely, 2^81343099 is an apocalyptic number.

81343099 is a deficient number, since it is larger than the sum of its proper divisors (19461).

81343099 is a wasteful number, since it uses less digits than its factorization.

81343099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19460.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 81343099 is about 9019.0409135340. The cubic root of 81343099 is about 433.2849172074.

It can be divided in two parts, 8134309 and 9, that added together give a palindrome (8134318).

The spelling of 81343099 in words is "eighty-one million, three hundred forty-three thousand, ninety-nine".