125638349 has 2 divisors, whose sum is σ = 125638350. Its totient is φ = 125638348.

The previous prime is 125638343. The next prime is 125638367. The reversal of 125638349 is 943836521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113955625 + 11682724 = 10675^2 + 3418^2 .

It is an emirp because it is prime and its reverse (943836521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125638349 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125638343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62819174 + 62819175.

It is an arithmetic number, because the mean of its divisors is an integer number (62819175).

Almost surely, 2^125638349 is an apocalyptic number.

It is an amenable number.

125638349 is a deficient number, since it is larger than the sum of its proper divisors (1).

125638349 is an equidigital number, since it uses as much as digits as its factorization.

125638349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The square root of 125638349 is about 11208.8513684498. The cubic root of 125638349 is about 500.8496872452.

The spelling of 125638349 in words is "one hundred twenty-five million, six hundred thirty-eight thousand, three hundred forty-nine".