81824017 has 4 divisors (see below), whose sum is σ = 89262576. Its totient is φ = 74385460.

The previous prime is 81824003. The next prime is 81824053. The reversal of 81824017 is 71042818.

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 a cyclic number.

It is not a de Polignac number, because 81824017 - 2¹⁵ = 81791249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81824017.

It is not an unprimeable number, because it can be changed into a prime (81824117) 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, 3719263 + ... + 3719284.

It is an arithmetic number, because the mean of its divisors is an integer number (22315644).

Almost surely, 2^81824017 is an apocalyptic number.

It is an amenable number.

81824017 is a deficient number, since it is larger than the sum of its proper divisors (7438559).

81824017 is a wasteful number, since it uses less digits than its factorization.

81824017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7438558.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 81824017 is about 9045.6628833933. The cubic root of 81824017 is about 434.1371313069.

The spelling of 81824017 in words is "eighty-one million, eight hundred twenty-four thousand, seventeen".