3125631205 has 4 divisors (see below), whose sum is σ = 3750757452. Its totient is φ = 2500504960.

The previous prime is 3125631193. The next prime is 3125631227. The reversal of 3125631205 is 5021365213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5021365213 = 31 ⋅161979523.

It can be written as a sum of positive squares in 2 ways, for example, as 512479044 + 2613152161 = 22638^2 + 51119^2 .

It is not a de Polignac number, because 3125631205 - 2¹³ = 3125623013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 312563116 + ... + 312563125.

It is an arithmetic number, because the mean of its divisors is an integer number (937689363).

Almost surely, 2^3125631205 is an apocalyptic number.

It is an amenable number.

3125631205 is a deficient number, since it is larger than the sum of its proper divisors (625126247).

3125631205 is an equidigital number, since it uses as much as digits as its factorization.

3125631205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625126246.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 3125631205 is about 55907.3448215885. The cubic root of 3125631205 is about 1462.1072973926.

Adding to 3125631205 its reverse (5021365213), we get a palindrome (8146996418).

The spelling of 3125631205 in words is "three billion, one hundred twenty-five million, six hundred thirty-one thousand, two hundred five".