18942101 has 2 divisors, whose sum is σ = 18942102. Its totient is φ = 18942100.

The previous prime is 18942089. The next prime is 18942109. The reversal of 18942101 is 10124981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17023876 + 1918225 = 4126^2 + 1385^2 .

It is an emirp because it is prime and its reverse (10124981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18942101 - 2²² = 14747797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18942109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9471050 + 9471051.

It is an arithmetic number, because the mean of its divisors is an integer number (9471051).

Almost surely, 2^18942101 is an apocalyptic number.

It is an amenable number.

18942101 is a deficient number, since it is larger than the sum of its proper divisors (1).

18942101 is an equidigital number, since it uses as much as digits as its factorization.

18942101 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 26.

The square root of 18942101 is about 4352.2524053644. The cubic root of 18942101 is about 266.5688403322.

The spelling of 18942101 in words is "eighteen million, nine hundred forty-two thousand, one hundred one".