18815057 has 2 divisors, whose sum is σ = 18815058. Its totient is φ = 18815056.

The previous prime is 18815029. The next prime is 18815059. The reversal of 18815057 is 75051881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18800896 + 14161 = 4336^2 + 119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18815057 is a prime.

Together with 18815059, 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 (18815059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9407528 + 9407529.

It is an arithmetic number, because the mean of its divisors is an integer number (9407529).

Almost surely, 2^18815057 is an apocalyptic number.

It is an amenable number.

18815057 is a deficient number, since it is larger than the sum of its proper divisors (1).

18815057 is an equidigital number, since it uses as much as digits as its factorization.

18815057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 18815057 is about 4337.6326492685. The cubic root of 18815057 is about 265.9715470725.

The spelling of 18815057 in words is "eighteen million, eight hundred fifteen thousand, fifty-seven".