18311201 has 2 divisors, whose sum is σ = 18311202. Its totient is φ = 18311200.

The previous prime is 18311191. The next prime is 18311207. The reversal of 18311201 is 10211381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10336225 + 7974976 = 3215^2 + 2824^2 .

It is a cyclic number.

It is not a de Polignac number, because 18311201 - 2¹⁰ = 18310177 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 18311201.

It is not a weakly prime, because it can be changed into another prime (18311207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9155600 + 9155601.

It is an arithmetic number, because the mean of its divisors is an integer number (9155601).

Almost surely, 2^18311201 is an apocalyptic number.

It is an amenable number.

18311201 is a deficient number, since it is larger than the sum of its proper divisors (1).

18311201 is an equidigital number, since it uses as much as digits as its factorization.

18311201 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 18311201 is about 4279.1589126837. The cubic root of 18311201 is about 263.5758464885.

Adding to 18311201 its reverse (10211381), we get a palindrome (28522582).

The spelling of 18311201 in words is "eighteen million, three hundred eleven thousand, two hundred one".