125446981109 has 2 divisors, whose sum is σ = 125446981110. Its totient is φ = 125446981108.

The previous prime is 125446981081. The next prime is 125446981183. The reversal of 125446981109 is 901189644521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98358758884 + 27088222225 = 313622^2 + 164585^2 .

It is an emirp because it is prime and its reverse (901189644521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125446981109 - 2¹² = 125446977013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125446981609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62723490554 + 62723490555.

It is an arithmetic number, because the mean of its divisors is an integer number (62723490555).

Almost surely, 2^125446981109 is an apocalyptic number.

It is an amenable number.

125446981109 is a deficient number, since it is larger than the sum of its proper divisors (1).

125446981109 is an equidigital number, since it uses as much as digits as its factorization.

125446981109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 125446981109 in words is "one hundred twenty-five billion, four hundred forty-six million, nine hundred eighty-one thousand, one hundred nine".