18451057 has 2 divisors, whose sum is σ = 18451058. Its totient is φ = 18451056.

The previous prime is 18451051. The next prime is 18451067. The reversal of 18451057 is 75015481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18181696 + 269361 = 4264^2 + 519^2 .

It is an emirp because it is prime and its reverse (75015481) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18451057 is a prime.

It is not a weakly prime, because it can be changed into another prime (18451051) 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, 9225528 + 9225529.

It is an arithmetic number, because the mean of its divisors is an integer number (9225529).

Almost surely, 2^18451057 is an apocalyptic number.

It is an amenable number.

18451057 is a deficient number, since it is larger than the sum of its proper divisors (1).

18451057 is an equidigital number, since it uses as much as digits as its factorization.

18451057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 18451057 is about 4295.4693573578. The cubic root of 18451057 is about 264.2451856319.

The spelling of 18451057 in words is "eighteen million, four hundred fifty-one thousand, fifty-seven".