18830281 has 2 divisors, whose sum is σ = 18830282. Its totient is φ = 18830280.

The previous prime is 18830257. The next prime is 18830291. The reversal of 18830281 is 18203881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17640000 + 1190281 = 4200^2 + 1091^2 .

It is a cyclic number.

It is not a de Polignac number, because 18830281 - 2¹⁹ = 18305993 is a prime.

It is a super-2 number, since 2×18830281² = 709158965077922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18830291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9415140 + 9415141.

It is an arithmetic number, because the mean of its divisors is an integer number (9415141).

Almost surely, 2^18830281 is an apocalyptic number.

18830281 is the 2320-th centered heptagonal number.

It is an amenable number.

18830281 is a deficient number, since it is larger than the sum of its proper divisors (1).

18830281 is an equidigital number, since it uses as much as digits as its factorization.

18830281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 18830281 is about 4339.3871687140. The cubic root of 18830281 is about 266.0432637339.

The spelling of 18830281 in words is "eighteen million, eight hundred thirty thousand, two hundred eighty-one".