125521111040009 has 2 divisors, whose sum is σ = 125521111040010. Its totient is φ = 125521111040008.

The previous prime is 125521111039999. The next prime is 125521111040027. The reversal of 125521111040009 is 900040111125521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123441054822409 + 2080056217600 = 11110403^2 + 1442240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125521111040009 is a prime.

It is not a weakly prime, because it can be changed into another prime (125521111040029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62760555520004 + 62760555520005.

It is an arithmetic number, because the mean of its divisors is an integer number (62760555520005).

Almost surely, 2^{125521111040009} is an apocalyptic number.

It is an amenable number.

125521111040009 is a deficient number, since it is larger than the sum of its proper divisors (1).

125521111040009 is an equidigital number, since it uses as much as digits as its factorization.

125521111040009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 32.

The spelling of 125521111040009 in words is "one hundred twenty-five trillion, five hundred twenty-one billion, one hundred eleven million, forty thousand, nine".