8087921 has 2 divisors, whose sum is σ = 8087922. Its totient is φ = 8087920.

The previous prime is 8087917. The next prime is 8087951. The reversal of 8087921 is 1297808.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6964321 + 1123600 = 2639^2 + 1060^2 .

It is a cyclic number.

It is not a de Polignac number, because 8087921 - 2² = 8087917 is a prime.

It is a super-2 number, since 2×8087921² = 130828932204482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8087951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4043960 + 4043961.

It is an arithmetic number, because the mean of its divisors is an integer number (4043961).

Almost surely, 2^8087921 is an apocalyptic number.

It is an amenable number.

8087921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8087921 is an equidigital number, since it uses as much as digits as its factorization.

8087921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 8087921 is about 2843.9270384453. The cubic root of 8087921 is about 200.7300072055.

The spelling of 8087921 in words is "eight million, eighty-seven thousand, nine hundred twenty-one".