18905101 has 2 divisors, whose sum is σ = 18905102. Its totient is φ = 18905100.

The previous prime is 18905087. The next prime is 18905111. The reversal of 18905101 is 10150981.

18905101 = 3074² + 3075².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9455625 + 9449476 = 3075^2 + 3074^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18905101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18905111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9452550 + 9452551.

It is an arithmetic number, because the mean of its divisors is an integer number (9452551).

Almost surely, 2^18905101 is an apocalyptic number.

18905101 is the 3075-th centered square number.

It is an amenable number.

18905101 is a deficient number, since it is larger than the sum of its proper divisors (1).

18905101 is an equidigital number, since it uses as much as digits as its factorization.

18905101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 18905101 is about 4347.9996550138. Note that the first 3 decimals coincide. The cubic root of 18905101 is about 266.3951623794.

The spelling of 18905101 in words is "eighteen million, nine hundred five thousand, one hundred one".