Search a number
-
+
18249997 is a prime number
BaseRepresentation
bin100010110011…
…1100100001101
31021100012021211
41011213210031
514132444442
61451054421
7311056663
oct105474415
937305254
1018249997
11a335547
126141411
133a1ca1c
1425d0c33
151907617
hex116790d

18249997 has 2 divisors, whose sum is σ = 18249998. Its totient is φ = 18249996.

The previous prime is 18249947. The next prime is 18250021. The reversal of 18249997 is 79994281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16491721 + 1758276 = 4061^2 + 1326^2 .

It is an emirp because it is prime and its reverse (79994281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18249997 - 223 = 9861389 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 18249997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18249947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9124998 + 9124999.

It is an arithmetic number, because the mean of its divisors is an integer number (9124999).

Almost surely, 218249997 is an apocalyptic number.

It is an amenable number.

18249997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18249997 is an equidigital number, since it uses as much as digits as its factorization.

18249997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 18249997 is about 4272.0015215353. The cubic root of 18249997 is about 263.2818569822.

The spelling of 18249997 in words is "eighteen million, two hundred forty-nine thousand, nine hundred ninety-seven".