1258125409 has 4 divisors (see below), whose sum is σ = 1332132804. Its totient is φ = 1184118016.

The previous prime is 1258125391. The next prime is 1258125419. The reversal of 1258125409 is 9045218521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 425514384 + 832611025 = 20628^2 + 28855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1258125409 - 2⁵ = 1258125377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1258125419) 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 3 ways as a sum of consecutive naturals, for example, 37003672 + ... + 37003705.

It is an arithmetic number, because the mean of its divisors is an integer number (333033201).

Almost surely, 2^1258125409 is an apocalyptic number.

It is an amenable number.

1258125409 is a deficient number, since it is larger than the sum of its proper divisors (74007395).

1258125409 is an equidigital number, since it uses as much as digits as its factorization.

1258125409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74007394.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 1258125409 is about 35470.0635606986. The cubic root of 1258125409 is about 1079.5463941577.

The spelling of 1258125409 in words is "one billion, two hundred fifty-eight million, one hundred twenty-five thousand, four hundred nine".