18297731549 has 2 divisors, whose sum is σ = 18297731550. Its totient is φ = 18297731548.

The previous prime is 18297731527. The next prime is 18297731603. The reversal of 18297731549 is 94513779281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12071416900 + 6226314649 = 109870^2 + 78907^2 .

It is a cyclic number.

It is not a de Polignac number, because 18297731549 - 2³² = 14002764253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18297731494 and 18297731503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18297731509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9148865774 + 9148865775.

It is an arithmetic number, because the mean of its divisors is an integer number (9148865775).

Almost surely, 2^18297731549 is an apocalyptic number.

It is an amenable number.

18297731549 is a deficient number, since it is larger than the sum of its proper divisors (1).

18297731549 is an equidigital number, since it uses as much as digits as its factorization.

18297731549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 56.

The spelling of 18297731549 in words is "eighteen billion, two hundred ninety-seven million, seven hundred thirty-one thousand, five hundred forty-nine".