125006121005 has 8 divisors (see below), whose sum is σ = 150009256824. Its totient is φ = 100003622400.

The previous prime is 125006121001. The next prime is 125006121017. The reversal of 125006121005 is 500121600521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2619494761 + 122386626244 = 51181^2 + 349838^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125006121005 - 2² = 125006121001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125006121001) 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 in 7 ways as a sum of consecutive naturals, for example, 610265 + ... + 788945.

It is an arithmetic number, because the mean of its divisors is an integer number (18751157103).

Almost surely, 2^125006121005 is an apocalyptic number.

It is an amenable number.

125006121005 is a deficient number, since it is larger than the sum of its proper divisors (25003135819).

125006121005 is a wasteful number, since it uses less digits than its factorization.

125006121005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318607.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 125006121005 its reverse (500121600521), we get a palindrome (625127721526).

The spelling of 125006121005 in words is "one hundred twenty-five billion, six million, one hundred twenty-one thousand, five".