81453505 has 8 divisors (see below), whose sum is σ = 111707712. Its totient is φ = 55853808.

The previous prime is 81453499. The next prime is 81453517. The reversal of 81453505 is 50535418.

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 81453505 - 2³ = 81453497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 1163587 + ... + 1163656.

It is an arithmetic number, because the mean of its divisors is an integer number (13963464).

Almost surely, 2^81453505 is an apocalyptic number.

It is an amenable number.

81453505 is a deficient number, since it is larger than the sum of its proper divisors (30254207).

81453505 is a wasteful number, since it uses less digits than its factorization.

81453505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327255.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 81453505 is about 9025.1595553763. The cubic root of 81453505 is about 433.4808593688.

The spelling of 81453505 in words is "eighty-one million, four hundred fifty-three thousand, five hundred five".