8115551 has 2 divisors, whose sum is σ = 8115552. Its totient is φ = 8115550.

The previous prime is 8115539. The next prime is 8115553. The reversal of 8115551 is 1555118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8115551 - 2¹⁴ = 8099167 is a prime.

Together with 8115553, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8115551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8115553) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4057775 + 4057776.

It is an arithmetic number, because the mean of its divisors is an integer number (4057776).

Almost surely, 2^8115551 is an apocalyptic number.

8115551 is a deficient number, since it is larger than the sum of its proper divisors (1).

8115551 is an equidigital number, since it uses as much as digits as its factorization.

8115551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1000, while the sum is 26.

The square root of 8115551 is about 2848.7806163339. The cubic root of 8115551 is about 200.9583257247.

The spelling of 8115551 in words is "eight million, one hundred fifteen thousand, five hundred fifty-one".