12021749 has 2 divisors, whose sum is σ = 12021750. Its totient is φ = 12021748.

The previous prime is 12021701. The next prime is 12021761. The reversal of 12021749 is 94712021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7102225 + 4919524 = 2665^2 + 2218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12023749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010874 + 6010875.

It is an arithmetic number, because the mean of its divisors is an integer number (6010875).

Almost surely, 2^12021749 is an apocalyptic number.

It is an amenable number.

12021749 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021749 is an equidigital number, since it uses as much as digits as its factorization.

12021749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 12021749 is about 3467.2393917928. The cubic root of 12021749 is about 229.0810783124.

The spelling of 12021749 in words is "twelve million, twenty-one thousand, seven hundred forty-nine".