81183395329 has 3 divisors (see below), whose sum is σ = 81183680257. Its totient is φ = 81183110402.

The previous prime is 81183395323. The next prime is 81183395341. The reversal of 81183395329 is 92359338118.

The square root of 81183395329 is 284927.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 81183395329 - 2¹⁷ = 81183264257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81183395323) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 142464 + ... + 427390.

Almost surely, 2^81183395329 is an apocalyptic number.

81183395329 is the 284927-th square number.

81183395329 is the 142464-th centered octagonal number.

It is an amenable number.

81183395329 is a deficient number, since it is larger than the sum of its proper divisors (284928).

81183395329 is an frugal number, since it uses more digits than its factorization.

81183395329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569854 (or 284927 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 52.

The spelling of 81183395329 in words is "eighty-one billion, one hundred eighty-three million, three hundred ninety-five thousand, three hundred twenty-nine".