12555749 has 2 divisors, whose sum is σ = 12555750. Its totient is φ = 12555748.

The previous prime is 12555743. The next prime is 12555757. The reversal of 12555749 is 94755521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10432900 + 2122849 = 3230^2 + 1457^2 .

It is a cyclic number.

It is not a de Polignac number, because 12555749 - 2¹² = 12551653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12555743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6277874 + 6277875.

It is an arithmetic number, because the mean of its divisors is an integer number (6277875).

Almost surely, 2^12555749 is an apocalyptic number.

It is an amenable number.

12555749 is a deficient number, since it is larger than the sum of its proper divisors (1).

12555749 is an equidigital number, since it uses as much as digits as its factorization.

12555749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63000, while the sum is 38.

The square root of 12555749 is about 3543.4092340569. The cubic root of 12555749 is about 232.4239486105.

The spelling of 12555749 in words is "twelve million, five hundred fifty-five thousand, seven hundred forty-nine".