126556819 has 2 divisors, whose sum is σ = 126556820. Its totient is φ = 126556818.

The previous prime is 126556763. The next prime is 126556847. The reversal of 126556819 is 918655621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126556819 - 2¹³ = 126548627 is a prime.

It is a super-2 number, since 2×126556819² = 32033256870797522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (126556219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63278409 + 63278410.

It is an arithmetic number, because the mean of its divisors is an integer number (63278410).

Almost surely, 2^126556819 is an apocalyptic number.

126556819 is a deficient number, since it is larger than the sum of its proper divisors (1).

126556819 is an equidigital number, since it uses as much as digits as its factorization.

126556819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 43.

The square root of 126556819 is about 11249.7475082777. The cubic root of 126556819 is about 502.0672002545.

The spelling of 126556819 in words is "one hundred twenty-six million, five hundred fifty-six thousand, eight hundred nineteen".