126315649 has 4 divisors (see below), whose sum is σ = 129003264. Its totient is φ = 123628036.

The previous prime is 126315647. The next prime is 126315659. The reversal of 126315649 is 946513621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 946513621 = 173 ⋅5471177.

It is a cyclic number.

It is not a de Polignac number, because 126315649 - 2¹ = 126315647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126315641) by changing a digit.

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, 1343737 + ... + 1343830.

It is an arithmetic number, because the mean of its divisors is an integer number (32250816).

Almost surely, 2^126315649 is an apocalyptic number.

It is an amenable number.

126315649 is a deficient number, since it is larger than the sum of its proper divisors (2687615).

126315649 is an equidigital number, since it uses as much as digits as its factorization.

126315649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687614.

The product of its digits is 38880, while the sum is 37.

The square root of 126315649 is about 11239.0234896098. The cubic root of 126315649 is about 501.7480799771.

The spelling of 126315649 in words is "one hundred twenty-six million, three hundred fifteen thousand, six hundred forty-nine".