81827417 has 4 divisors (see below), whose sum is σ = 93517056. Its totient is φ = 70137780.

The previous prime is 81827393. The next prime is 81827441. The reversal of 81827417 is 71472818.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71472818 = 2 ⋅35736409.

It is an interprime number because it is at equal distance from previous prime (81827393) and next prime (81827441).

It is a cyclic number.

It is not a de Polignac number, because 81827417 - 2¹² = 81823321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81827117) 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, 5844809 + ... + 5844822.

It is an arithmetic number, because the mean of its divisors is an integer number (23379264).

Almost surely, 2^81827417 is an apocalyptic number.

It is an amenable number.

81827417 is a deficient number, since it is larger than the sum of its proper divisors (11689639).

81827417 is a wasteful number, since it uses less digits than its factorization.

81827417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11689638.

The product of its digits is 25088, while the sum is 38.

The square root of 81827417 is about 9045.8508168110. The cubic root of 81827417 is about 434.1431443980.

The spelling of 81827417 in words is "eighty-one million, eight hundred twenty-seven thousand, four hundred seventeen".