125000005 has 24 divisors (see below), whose sum is σ = 168059880. Its totient is φ = 89107200.

The previous prime is 125000003. The next prime is 125000077. The reversal of 125000005 is 500000521.

It can be written as a sum of positive squares in 12 ways, for example, as 110628324 + 14371681 = 10518^2 + 3791^2 .

It is not a de Polignac number, because 125000005 - 2¹ = 125000003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125000003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21955 + ... + 27055.

It is an arithmetic number, because the mean of its divisors is an integer number (7002495).

Almost surely, 2^125000005 is an apocalyptic number.

It is an amenable number.

125000005 is a deficient number, since it is larger than the sum of its proper divisors (43059875).

125000005 is a wasteful number, since it uses less digits than its factorization.

125000005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5161 (or 5148 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 125000005 is about 11180.3401111057. The cubic root of 125000005 is about 500.0000066667. Note that the first 5 decimals are identical.

Adding to 125000005 its reverse (500000521), we get a palindrome (625000526).

The spelling of 125000005 in words is "one hundred twenty-five million, five", and thus it is an aban number.