81825429 has 8 divisors (see below), whose sum is σ = 124686400. Its totient is φ = 46757376.

The previous prime is 81825427. The next prime is 81825433. The reversal of 81825429 is 92452818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81825429 - 2¹ = 81825427 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81825427) 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, 1948204 + ... + 1948245.

It is an arithmetic number, because the mean of its divisors is an integer number (15585800).

Almost surely, 2^81825429 is an apocalyptic number.

It is an amenable number.

81825429 is a deficient number, since it is larger than the sum of its proper divisors (42860971).

81825429 is a wasteful number, since it uses less digits than its factorization.

81825429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3896459.

The product of its digits is 46080, while the sum is 39.

The square root of 81825429 is about 9045.7409315103. The cubic root of 81825429 is about 434.1396285285.

The spelling of 81825429 in words is "eighty-one million, eight hundred twenty-five thousand, four hundred twenty-nine".