81141449 has 8 divisors (see below), whose sum is σ = 84322560. Its totient is φ = 77985936.

The previous prime is 81141421. The next prime is 81141479. The reversal of 81141449 is 94414118.

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 81141449 - 2²⁴ = 64364233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81141479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194 + ... + 12740.

It is an arithmetic number, because the mean of its divisors is an integer number (10540320).

Almost surely, 2^81141449 is an apocalyptic number.

It is an amenable number.

81141449 is a deficient number, since it is larger than the sum of its proper divisors (3181111).

81141449 is a wasteful number, since it uses less digits than its factorization.

81141449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12799.

The product of its digits is 4608, while the sum is 32.

The square root of 81141449 is about 9007.8548500739. The cubic root of 81141449 is about 432.9265823570.

The spelling of 81141449 in words is "eighty-one million, one hundred forty-one thousand, four hundred forty-nine".