125145315209 has 2 divisors, whose sum is σ = 125145315210. Its totient is φ = 125145315208.

The previous prime is 125145315199. The next prime is 125145315257. The reversal of 125145315209 is 902513541521.

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., 107295553600 + 17849761609 = 327560^2 + 133603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125145315209 is a prime.

It is a super-2 number, since 2×125145315209² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (125145311209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62572657604 + 62572657605.

It is an arithmetic number, because the mean of its divisors is an integer number (62572657605).

Almost surely, 2^125145315209 is an apocalyptic number.

It is an amenable number.

125145315209 is a deficient number, since it is larger than the sum of its proper divisors (1).

125145315209 is an equidigital number, since it uses as much as digits as its factorization.

125145315209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 125145315209 in words is "one hundred twenty-five billion, one hundred forty-five million, three hundred fifteen thousand, two hundred nine".