18615061 has 2 divisors, whose sum is σ = 18615062. Its totient is φ = 18615060.

The previous prime is 18615059. The next prime is 18615067. The reversal of 18615061 is 16051681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9579025 + 9036036 = 3095^2 + 3006^2 .

It is an emirp because it is prime and its reverse (16051681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18615061 - 2¹ = 18615059 is a prime.

Together with 18615059, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1188055 and since 18615061 and 1188055 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 (18615067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9307530 + 9307531.

It is an arithmetic number, because the mean of its divisors is an integer number (9307531).

Almost surely, 2^18615061 is an apocalyptic number.

It is an amenable number.

18615061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18615061 is an equidigital number, since it uses as much as digits as its factorization.

18615061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 18615061 is about 4314.5174701234. The cubic root of 18615061 is about 265.0258002648.

The spelling of 18615061 in words is "eighteen million, six hundred fifteen thousand, sixty-one".