126258821 has 8 divisors (see below), whose sum is σ = 136059000. Its totient is φ = 116471232.

The previous prime is 126258767. The next prime is 126258859. The reversal of 126258821 is 128852621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2937796 + 123321025 = 1714^2 + 11105^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126258821 - 2⁶ = 126258757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126258421) 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 7 ways as a sum of consecutive naturals, for example, 33971 + ... + 37503.

It is an arithmetic number, because the mean of its divisors is an integer number (17007375).

Almost surely, 2^126258821 is an apocalyptic number.

It is an amenable number.

126258821 is a deficient number, since it is larger than the sum of its proper divisors (9800179).

126258821 is a wasteful number, since it uses less digits than its factorization.

126258821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6295.

The product of its digits is 15360, while the sum is 35.

The square root of 126258821 is about 11236.4950496140. The cubic root of 126258821 is about 501.6728250710.

The spelling of 126258821 in words is "one hundred twenty-six million, two hundred fifty-eight thousand, eight hundred twenty-one".