18312101 has 2 divisors, whose sum is σ = 18312102. Its totient is φ = 18312100.

The previous prime is 18312059. The next prime is 18312131. The reversal of 18312101 is 10121381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17023876 + 1288225 = 4126^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 18312101 - 2⁶ = 18312037 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18312101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18312131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9156050 + 9156051.

It is an arithmetic number, because the mean of its divisors is an integer number (9156051).

Almost surely, 2^18312101 is an apocalyptic number.

It is an amenable number.

18312101 is a deficient number, since it is larger than the sum of its proper divisors (1).

18312101 is an equidigital number, since it uses as much as digits as its factorization.

18312101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 18312101 is about 4279.2640722442. The cubic root of 18312101 is about 263.5801646902.

Adding to 18312101 its reverse (10121381), we get a palindrome (28433482).

The spelling of 18312101 in words is "eighteen million, three hundred twelve thousand, one hundred one".