125134381817 has 2 divisors, whose sum is σ = 125134381818. Its totient is φ = 125134381816.

The previous prime is 125134381787. The next prime is 125134381891. The reversal of 125134381817 is 718183431521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83015439376 + 42118942441 = 288124^2 + 205229^2 .

It is a cyclic number.

It is not a de Polignac number, because 125134381817 - 2³⁰ = 124060639993 is a prime.

It is a super-2 number, since 2×125134381817² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125134311817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62567190908 + 62567190909.

It is an arithmetic number, because the mean of its divisors is an integer number (62567190909).

Almost surely, 2^125134381817 is an apocalyptic number.

It is an amenable number.

125134381817 is a deficient number, since it is larger than the sum of its proper divisors (1).

125134381817 is an equidigital number, since it uses as much as digits as its factorization.

125134381817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The spelling of 125134381817 in words is "one hundred twenty-five billion, one hundred thirty-four million, three hundred eighty-one thousand, eight hundred seventeen".