126537813 has 6 divisors (see below), whose sum is σ = 182776854. Its totient is φ = 84358536.

The previous prime is 126537811. The next prime is 126537839. The reversal of 126537813 is 318735621.

It can be written as a sum of positive squares in only one way, i.e., 77845329 + 48692484 = 8823^2 + 6978^2 .

It is not a de Polignac number, because 126537813 - 2¹ = 126537811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126537811) 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 5 ways as a sum of consecutive naturals, for example, 7029870 + ... + 7029887.

It is an arithmetic number, because the mean of its divisors is an integer number (30462809).

Almost surely, 2^126537813 is an apocalyptic number.

It is an amenable number.

126537813 is a deficient number, since it is larger than the sum of its proper divisors (56239041).

126537813 is a wasteful number, since it uses less digits than its factorization.

126537813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14059763 (or 14059760 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 126537813 is about 11248.9027464904. The cubic root of 126537813 is about 502.0420659130.

The spelling of 126537813 in words is "one hundred twenty-six million, five hundred thirty-seven thousand, eight hundred thirteen".