126531243 has 24 divisors (see below), whose sum is σ = 190201856. Its totient is φ = 80967600.

The previous prime is 126531239. The next prime is 126531269. The reversal of 126531243 is 342135621.

126531243 is a `hidden beast` number, since 1 + 2 + 653 + 1 + 2 + 4 + 3 = 666.

It is not a de Polignac number, because 126531243 - 2² = 126531239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126536243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33648 + ... + 37218.

Almost surely, 2^126531243 is an apocalyptic number.

126531243 is a deficient number, since it is larger than the sum of its proper divisors (63670613).

126531243 is a wasteful number, since it uses less digits than its factorization.

126531243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3735 (or 3732 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 126531243 is about 11248.6107142171. The cubic root of 126531243 is about 502.0333768806.

Adding to 126531243 its reverse (342135621), we get a palindrome (468666864).

The spelling of 126531243 in words is "one hundred twenty-six million, five hundred thirty-one thousand, two hundred forty-three".