8121281 has 8 divisors (see below), whose sum is σ = 9497664. Its totient is φ = 6798960.

The previous prime is 8121209. The next prime is 8121283. The reversal of 8121281 is 1821218.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-8121281 is a prime.

It is a super-2 number, since 2×8121281² = 131910410161922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8121283) 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, 13190 + ... + 13791.

It is an arithmetic number, because the mean of its divisors is an integer number (1187208).

Almost surely, 2^8121281 is an apocalyptic number.

It is an amenable number.

8121281 is a deficient number, since it is larger than the sum of its proper divisors (1376383).

8121281 is a wasteful number, since it uses less digits than its factorization.

8121281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27031.

The product of its digits is 256, while the sum is 23.

The square root of 8121281 is about 2849.7861323264. The cubic root of 8121281 is about 201.0056102656.

Adding to 8121281 its reverse (1821218), we get a palindrome (9942499).

The spelling of 8121281 in words is "eight million, one hundred twenty-one thousand, two hundred eighty-one".