81231353 has 8 divisors (see below), whose sum is σ = 93955008. Its totient is φ = 68787504.

The previous prime is 81231347. The next prime is 81231379. The reversal of 81231353 is 35313218.

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 81231353 - 2⁸ = 81231097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81231323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69326 + ... + 70487.

It is an arithmetic number, because the mean of its divisors is an integer number (11744376).

Almost surely, 2^81231353 is an apocalyptic number.

81231353 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

It is an amenable number.

81231353 is a deficient number, since it is larger than the sum of its proper divisors (12723655).

81231353 is a wasteful number, since it uses less digits than its factorization.

81231353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139903.

The product of its digits is 2160, while the sum is 26.

The square root of 81231353 is about 9012.8437798511. The cubic root of 81231353 is about 433.0864162675.

The spelling of 81231353 in words is "eighty-one million, two hundred thirty-one thousand, three hundred fifty-three".