18281077 has 2 divisors, whose sum is σ = 18281078. Its totient is φ = 18281076.

The previous prime is 18281047. The next prime is 18281089. The reversal of 18281077 is 77018281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13845841 + 4435236 = 3721^2 + 2106^2 .

It is an emirp because it is prime and its reverse (77018281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18281077 - 2⁷ = 18280949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18281047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9140538 + 9140539.

It is an arithmetic number, because the mean of its divisors is an integer number (9140539).

Almost surely, 2^18281077 is an apocalyptic number.

It is an amenable number.

18281077 is a deficient number, since it is larger than the sum of its proper divisors (1).

18281077 is an equidigital number, since it uses as much as digits as its factorization.

18281077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 18281077 is about 4275.6376132689. The cubic root of 18281077 is about 263.4312297805.

The spelling of 18281077 in words is "eighteen million, two hundred eighty-one thousand, seventy-seven".