18525161 has 2 divisors, whose sum is σ = 18525162. Its totient is φ = 18525160.

The previous prime is 18525139. The next prime is 18525179. The reversal of 18525161 is 16152581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12673600 + 5851561 = 3560^2 + 2419^2 .

It is a cyclic number.

It is not a de Polignac number, because 18525161 - 2¹⁸ = 18263017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18525181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9262580 + 9262581.

It is an arithmetic number, because the mean of its divisors is an integer number (9262581).

Almost surely, 2^18525161 is an apocalyptic number.

It is an amenable number.

18525161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18525161 is an equidigital number, since it uses as much as digits as its factorization.

18525161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 29.

The square root of 18525161 is about 4304.0865465276. The cubic root of 18525161 is about 264.5984710596.

It can be divided in two parts, 185251 and 61, that multiplied together give a palindrome (11300311).

The spelling of 18525161 in words is "eighteen million, five hundred twenty-five thousand, one hundred sixty-one".