81324417 has 8 divisors (see below), whose sum is σ = 109805440. Its totient is φ = 53529840.

The previous prime is 81324403. The next prime is 81324431. The reversal of 81324417 is 71442318.

It is an interprime number because it is at equal distance from previous prime (81324403) and next prime (81324431).

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

It is not a de Polignac number, because 81324417 - 2⁷ = 81324289 is a prime.

It is a super-2 number, since 2×81324417² = 13227321600779778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81324437) 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, 171334 + ... + 171807.

It is an arithmetic number, because the mean of its divisors is an integer number (13725680).

Almost surely, 2^81324417 is an apocalyptic number.

It is an amenable number.

81324417 is a deficient number, since it is larger than the sum of its proper divisors (28481023).

81324417 is a wasteful number, since it uses less digits than its factorization.

81324417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343223.

The product of its digits is 5376, while the sum is 30.

The square root of 81324417 is about 9018.0051563525. The cubic root of 81324417 is about 433.2517439421.

The spelling of 81324417 in words is "eighty-one million, three hundred twenty-four thousand, four hundred seventeen".