81399353 has 8 divisors (see below), whose sum is σ = 93391872. Its totient is φ = 69497856.

The previous prime is 81399313. The next prime is 81399377. The reversal of 81399353 is 35399318.

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-81399353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81399353.

It is not an unprimeable number, because it can be changed into a prime (81399313) 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 7 ways as a sum of consecutive naturals, for example, 20825 + ... + 24422.

It is an arithmetic number, because the mean of its divisors is an integer number (11673984).

Almost surely, 2^81399353 is an apocalyptic number.

It is an amenable number.

81399353 is a deficient number, since it is larger than the sum of its proper divisors (11992519).

81399353 is a wasteful number, since it uses less digits than its factorization.

81399353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45511.

The product of its digits is 87480, while the sum is 41.

The square root of 81399353 is about 9022.1589988206. The cubic root of 81399353 is about 433.3847756812.

The spelling of 81399353 in words is "eighty-one million, three hundred ninety-nine thousand, three hundred fifty-three".