18700061 has 2 divisors, whose sum is σ = 18700062. Its totient is φ = 18700060.

The previous prime is 18700039. The next prime is 18700063. The reversal of 18700061 is 16000781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14394436 + 4305625 = 3794^2 + 2075^2 .

It is an emirp because it is prime and its reverse (16000781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18700061 - 2⁶ = 18699997 is a prime.

Together with 18700063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18700063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9350030 + 9350031.

It is an arithmetic number, because the mean of its divisors is an integer number (9350031).

Almost surely, 2^18700061 is an apocalyptic number.

It is an amenable number.

18700061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18700061 is an equidigital number, since it uses as much as digits as its factorization.

18700061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 18700061 is about 4324.3567151659. The cubic root of 18700061 is about 265.4285743391.

The spelling of 18700061 in words is "eighteen million, seven hundred thousand, sixty-one".