18267481 has 2 divisors, whose sum is σ = 18267482. Its totient is φ = 18267480.

The previous prime is 18267461. The next prime is 18267499. The reversal of 18267481 is 18476281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14561856 + 3705625 = 3816^2 + 1925^2 .

It is a cyclic number.

It is not a de Polignac number, because 18267481 - 2¹⁷ = 18136409 is a prime.

It is a super-2 number, since 2×18267481² = 667401724170722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18267481.

It is not a weakly prime, because it can be changed into another prime (18267461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9133740 + 9133741.

It is an arithmetic number, because the mean of its divisors is an integer number (9133741).

Almost surely, 2^18267481 is an apocalyptic number.

It is an amenable number.

18267481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18267481 is an equidigital number, since it uses as much as digits as its factorization.

18267481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 37.

The square root of 18267481 is about 4274.0473792414. The cubic root of 18267481 is about 263.3659072383.

The spelling of 18267481 in words is "eighteen million, two hundred sixty-seven thousand, four hundred eighty-one".