81714121 has 4 divisors (see below), whose sum is σ = 86520852. Its totient is φ = 76907392.

The previous prime is 81714119. The next prime is 81714173. The reversal of 81714121 is 12141718.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 76125625 + 5588496 = 8725^2 + 2364^2 .

It is a cyclic number.

It is not a de Polignac number, because 81714121 - 2¹ = 81714119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81714821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2403340 + ... + 2403373.

It is an arithmetic number, because the mean of its divisors is an integer number (21630213).

Almost surely, 2^81714121 is an apocalyptic number.

It is an amenable number.

81714121 is a deficient number, since it is larger than the sum of its proper divisors (4806731).

81714121 is a wasteful number, since it uses less digits than its factorization.

81714121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4806730.

The product of its digits is 448, while the sum is 25.

The square root of 81714121 is about 9039.5863290308. The cubic root of 81714121 is about 433.9426842840.

Adding to 81714121 its reverse (12141718), we get a palindrome (93855839).

The spelling of 81714121 in words is "eighty-one million, seven hundred fourteen thousand, one hundred twenty-one".