81825357 has 4 divisors (see below), whose sum is σ = 109100480. Its totient is φ = 54550236.

The previous prime is 81825353. The next prime is 81825371. The reversal of 81825357 is 75352818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 81825357 - 2² = 81825353 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 (81825353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13637557 + ... + 13637562.

It is an arithmetic number, because the mean of its divisors is an integer number (27275120).

Almost surely, 2^81825357 is an apocalyptic number.

It is an amenable number.

81825357 is a deficient number, since it is larger than the sum of its proper divisors (27275123).

81825357 is a wasteful number, since it uses less digits than its factorization.

81825357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27275122.

The product of its digits is 67200, while the sum is 39.

The square root of 81825357 is about 9045.7369517359. The cubic root of 81825357 is about 434.1395011921.

The spelling of 81825357 in words is "eighty-one million, eight hundred twenty-five thousand, three hundred fifty-seven".