18273061 has 2 divisors, whose sum is σ = 18273062. Its totient is φ = 18273060.

The previous prime is 18273037. The next prime is 18273071. The reversal of 18273061 is 16037281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9828225 + 8444836 = 3135^2 + 2906^2 .

It is a cyclic number.

It is not a de Polignac number, because 18273061 - 2⁵ = 18273029 is a prime.

It is equal to p_1167643 and since 18273061 and 1167643 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18273001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9136530 + 9136531.

It is an arithmetic number, because the mean of its divisors is an integer number (9136531).

Almost surely, 2^18273061 is an apocalyptic number.

It is an amenable number.

18273061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18273061 is an equidigital number, since it uses as much as digits as its factorization.

18273061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 18273061 is about 4274.7001064402. The cubic root of 18273061 is about 263.3927204983.

The spelling of 18273061 in words is "eighteen million, two hundred seventy-three thousand, sixty-one".