126501821 has 2 divisors, whose sum is σ = 126501822. Its totient is φ = 126501820.

The previous prime is 126501797. The next prime is 126501833. The reversal of 126501821 is 128105621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103327225 + 23174596 = 10165^2 + 4814^2 .

It is a cyclic number.

It is not a de Polignac number, because 126501821 - 2⁶ = 126501757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126501521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63250910 + 63250911.

It is an arithmetic number, because the mean of its divisors is an integer number (63250911).

Almost surely, 2^126501821 is an apocalyptic number.

It is an amenable number.

126501821 is a deficient number, since it is larger than the sum of its proper divisors (1).

126501821 is an equidigital number, since it uses as much as digits as its factorization.

126501821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 126501821 is about 11247.3028322349. The cubic root of 126501821 is about 501.9944616670.

The spelling of 126501821 in words is "one hundred twenty-six million, five hundred one thousand, eight hundred twenty-one".