18301861 has 2 divisors, whose sum is σ = 18301862. Its totient is φ = 18301860.

The previous prime is 18301853. The next prime is 18301889. The reversal of 18301861 is 16810381.

It is a happy number.

It is an a-pointer prime, because the next prime (18301889) can be obtained adding 18301861 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15256836 + 3045025 = 3906^2 + 1745^2 .

It is a cyclic number.

It is not a de Polignac number, because 18301861 - 2³ = 18301853 is a prime.

It is equal to p_1169371 and since 18301861 and 1169371 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 (18301841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9150930 + 9150931.

It is an arithmetic number, because the mean of its divisors is an integer number (9150931).

Almost surely, 2^18301861 is an apocalyptic number.

It is an amenable number.

18301861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18301861 is an equidigital number, since it uses as much as digits as its factorization.

18301861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 18301861 is about 4278.0674375236. The cubic root of 18301861 is about 263.5310247956.

The spelling of 18301861 in words is "eighteen million, three hundred one thousand, eight hundred sixty-one".