12197749 has 2 divisors, whose sum is σ = 12197750. Its totient is φ = 12197748.

The previous prime is 12197747. The next prime is 12197821. The reversal of 12197749 is 94779121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6708100 + 5489649 = 2590^2 + 2343^2 .

It is a cyclic number.

It is not a de Polignac number, because 12197749 - 2¹ = 12197747 is a prime.

Together with 12197747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12197747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6098874 + 6098875.

It is an arithmetic number, because the mean of its divisors is an integer number (6098875).

Almost surely, 2^12197749 is an apocalyptic number.

It is an amenable number.

12197749 is a deficient number, since it is larger than the sum of its proper divisors (1).

12197749 is an equidigital number, since it uses as much as digits as its factorization.

12197749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 40.

The square root of 12197749 is about 3492.5275947371. The cubic root of 12197749 is about 230.1935925197.

It can be divided in two parts, 1219 and 7749, that multiplied together give a triangular number (9446031 = T₄₃₄₆).

The spelling of 12197749 in words is "twelve million, one hundred ninety-seven thousand, seven hundred forty-nine".