126251305 has 4 divisors (see below), whose sum is σ = 151501572. Its totient is φ = 101001040.

The previous prime is 126251287. The next prime is 126251317. The reversal of 126251305 is 503152621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503152621 = 17 ⋅29597213.

It can be written as a sum of positive squares in 2 ways, for example, as 33860761 + 92390544 = 5819^2 + 9612^2 .

It is not a de Polignac number, because 126251305 - 2⁹ = 126250793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126251305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12625126 + ... + 12625135.

It is an arithmetic number, because the mean of its divisors is an integer number (37875393).

Almost surely, 2^126251305 is an apocalyptic number.

It is an amenable number.

126251305 is a deficient number, since it is larger than the sum of its proper divisors (25250267).

126251305 is an equidigital number, since it uses as much as digits as its factorization.

126251305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25250266.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 126251305 is about 11236.1605987099. The cubic root of 126251305 is about 501.6628702609.

The spelling of 126251305 in words is "one hundred twenty-six million, two hundred fifty-one thousand, three hundred five".