18949297 has 2 divisors, whose sum is σ = 18949298. Its totient is φ = 18949296.

The previous prime is 18949253. The next prime is 18949303. The reversal of 18949297 is 79294981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18870336 + 78961 = 4344^2 + 281^2 .

It is an emirp because it is prime and its reverse (79294981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18949297 - 2¹⁹ = 18425009 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 18949297.

It is not a weakly prime, because it can be changed into another prime (18949247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474648 + 9474649.

It is an arithmetic number, because the mean of its divisors is an integer number (9474649).

Almost surely, 2^18949297 is an apocalyptic number.

It is an amenable number.

18949297 is a deficient number, since it is larger than the sum of its proper divisors (1).

18949297 is an equidigital number, since it uses as much as digits as its factorization.

18949297 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18949297 is about 4353.0790252418. The cubic root of 18949297 is about 266.6025920707.

The spelling of 18949297 in words is "eighteen million, nine hundred forty-nine thousand, two hundred ninety-seven".