126016621 has 2 divisors, whose sum is σ = 126016622. Its totient is φ = 126016620.

The previous prime is 126016619. The next prime is 126016633. The reversal of 126016621 is 126610621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88623396 + 37393225 = 9414^2 + 6115^2 .

It is a cyclic number.

It is not a de Polignac number, because 126016621 - 2¹ = 126016619 is a prime.

Together with 126016619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126016021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63008310 + 63008311.

It is an arithmetic number, because the mean of its divisors is an integer number (63008311).

Almost surely, 2^126016621 is an apocalyptic number.

It is an amenable number.

126016621 is a deficient number, since it is larger than the sum of its proper divisors (1).

126016621 is an equidigital number, since it uses as much as digits as its factorization.

126016621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 126016621 is about 11225.7124940914. The cubic root of 126016621 is about 501.3518364492.

The spelling of 126016621 in words is "one hundred twenty-six million, sixteen thousand, six hundred twenty-one".