3125729 has 2 divisors, whose sum is σ = 3125730. Its totient is φ = 3125728.

The previous prime is 3125719. The next prime is 3125737. The reversal of 3125729 is 9275213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3055504 + 70225 = 1748^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 3125729 - 2¹² = 3121633 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3125719) by changing a digit.

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 as a sum of consecutive naturals, namely, 1562864 + 1562865.

It is an arithmetic number, because the mean of its divisors is an integer number (1562865).

Almost surely, 2^3125729 is an apocalyptic number.

It is an amenable number.

3125729 is a deficient number, since it is larger than the sum of its proper divisors (1).

3125729 is an equidigital number, since it uses as much as digits as its factorization.

3125729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 29.

The square root of 3125729 is about 1767.9731332800. The cubic root of 3125729 is about 146.2122546077.

The spelling of 3125729 in words is "three million, one hundred twenty-five thousand, seven hundred twenty-nine".