8661251 has 2 divisors, whose sum is σ = 8661252. Its totient is φ = 8661250.

The previous prime is 8661241. The next prime is 8661253. The reversal of 8661251 is 1521668.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8661251 - 2¹⁰ = 8660227 is a prime.

Together with 8661253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8661253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4330625 + 4330626.

It is an arithmetic number, because the mean of its divisors is an integer number (4330626).

Almost surely, 2^8661251 is an apocalyptic number.

8661251 is a deficient number, since it is larger than the sum of its proper divisors (1).

8661251 is an equidigital number, since it uses as much as digits as its factorization.

8661251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 29.

The square root of 8661251 is about 2943.0003397893. Note that the first 3 decimals coincide. The cubic root of 8661251 is about 205.3652105758.

The spelling of 8661251 in words is "eight million, six hundred sixty-one thousand, two hundred fifty-one".