1250000005 has 12 divisors (see below), whose sum is σ = 1537488036. Its totient is φ = 975603200.

The previous prime is 1249999997. The next prime is 1250000027. The reversal of 1250000005 is 5000000521.

It can be written as a sum of positive squares in 6 ways, for example, as 768065796 + 481934209 = 27714^2 + 21953^2 .

It is not a de Polignac number, because 1250000005 - 2³ = 1249999997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1250000005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65956 + ... + 82765.

It is an arithmetic number, because the mean of its divisors is an integer number (128124003).

Almost surely, 2^1250000005 is an apocalyptic number.

It is an amenable number.

1250000005 is a deficient number, since it is larger than the sum of its proper divisors (287488031).

1250000005 is an equidigital number, since it uses as much as digits as its factorization.

1250000005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148808 (or 148767 counting only the distinct ones).

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

The square root of 1250000005 is about 35355.3391300381. The cubic root of 1250000005 is about 1077.2173464522.

Adding to 1250000005 its reverse (5000000521), we get a palindrome (6250000526).

It can be divided in two parts, 125000000 and 5, that multiplied together give a square (625000000 = 25000²).

The spelling of 1250000005 in words is "one billion, two hundred fifty million, five", and thus it is an aban number.