126521451 has 12 divisors (see below), whose sum is σ = 208860912. Its totient is φ = 72297936.

The previous prime is 126521443. The next prime is 126521453. The reversal of 126521451 is 154125621.

126521451 is a `hidden beast` number, since 1 + 2 + 652 + 1 + 4 + 5 + 1 = 666.

It is not a de Polignac number, because 126521451 - 2³ = 126521443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126521453) 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 11 ways as a sum of consecutive naturals, for example, 1004076 + ... + 1004201.

It is an arithmetic number, because the mean of its divisors is an integer number (17405076).

Almost surely, 2^126521451 is an apocalyptic number.

126521451 is a deficient number, since it is larger than the sum of its proper divisors (82339461).

126521451 is a wasteful number, since it uses less digits than its factorization.

126521451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2008290 (or 2008287 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 126521451 is about 11248.1754520455. The cubic root of 126521451 is about 502.0204260933.

The spelling of 126521451 in words is "one hundred twenty-six million, five hundred twenty-one thousand, four hundred fifty-one".