18430481 has 2 divisors, whose sum is σ = 18430482. Its totient is φ = 18430480.

The previous prime is 18430459. The next prime is 18430487. The reversal of 18430481 is 18403481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 2430481 = 4000^2 + 1559^2 .

It is an emirp because it is prime and its reverse (18403481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18430481 - 2⁶ = 18430417 is a prime.

It is a super-2 number, since 2×18430481² = 679365259782722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18430487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9215240 + 9215241.

It is an arithmetic number, because the mean of its divisors is an integer number (9215241).

Almost surely, 2^18430481 is an apocalyptic number.

It is an amenable number.

18430481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18430481 is an equidigital number, since it uses as much as digits as its factorization.

18430481 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 29.

The square root of 18430481 is about 4293.0736075684. The cubic root of 18430481 is about 264.1469233067.

Subtracting from 18430481 its reverse (18403481), we obtain a cube (27000 = 30³).

The spelling of 18430481 in words is "eighteen million, four hundred thirty thousand, four hundred eighty-one".