81425449 has 8 divisors (see below), whose sum is σ = 93112640. Its totient is φ = 69752016.

The previous prime is 81425447. The next prime is 81425453. The reversal of 81425449 is 94452418.

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 81425449 - 2¹ = 81425447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81425447) 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, 19207 + ... + 23059.

It is an arithmetic number, because the mean of its divisors is an integer number (11639080).

Almost surely, 2^81425449 is an apocalyptic number.

It is an amenable number.

81425449 is a deficient number, since it is larger than the sum of its proper divisors (11687191).

81425449 is a wasteful number, since it uses less digits than its factorization.

81425449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6879.

The product of its digits is 46080, while the sum is 37.

The square root of 81425449 is about 9023.6050999587. The cubic root of 81425449 is about 433.4310839966.

The spelling of 81425449 in words is "eighty-one million, four hundred twenty-five thousand, four hundred forty-nine".