18048521 has 2 divisors, whose sum is σ = 18048522. Its totient is φ = 18048520.

The previous prime is 18048467. The next prime is 18048523. The reversal of 18048521 is 12584081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15523600 + 2524921 = 3940^2 + 1589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18048521 is a prime.

It is a super-2 number, since 2×18048521² = 651498220574882, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 18048523, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18048523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9024260 + 9024261.

It is an arithmetic number, because the mean of its divisors is an integer number (9024261).

Almost surely, 2^18048521 is an apocalyptic number.

It is an amenable number.

18048521 is a deficient number, since it is larger than the sum of its proper divisors (1).

18048521 is an equidigital number, since it uses as much as digits as its factorization.

18048521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 18048521 is about 4248.3550934450. The cubic root of 18048521 is about 262.3094114674.

The spelling of 18048521 in words is "eighteen million, forty-eight thousand, five hundred twenty-one".