18162061 has 2 divisors, whose sum is σ = 18162062. Its totient is φ = 18162060.

The previous prime is 18162049. The next prime is 18162071. The reversal of 18162061 is 16026181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14668900 + 3493161 = 3830^2 + 1869^2 .

It is an emirp because it is prime and its reverse (16026181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18162061 - 2¹¹ = 18160013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18162031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9081030 + 9081031.

It is an arithmetic number, because the mean of its divisors is an integer number (9081031).

Almost surely, 2^18162061 is an apocalyptic number.

It is an amenable number.

18162061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18162061 is an equidigital number, since it uses as much as digits as its factorization.

18162061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 18162061 is about 4261.6969624787. The cubic root of 18162061 is about 262.8583091783.

The spelling of 18162061 in words is "eighteen million, one hundred sixty-two thousand, sixty-one".