1258242009 has 4 divisors (see below), whose sum is σ = 1677656016. Its totient is φ = 838828004.

The previous prime is 1258241993. The next prime is 1258242023. The reversal of 1258242009 is 9002428521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9002428521 = 3 ⋅3000809507.

It is a cyclic number.

It is not a de Polignac number, because 1258242009 - 2⁴ = 1258241993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1258242109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209706999 + ... + 209707004.

It is an arithmetic number, because the mean of its divisors is an integer number (419414004).

Almost surely, 2^1258242009 is an apocalyptic number.

It is an amenable number.

1258242009 is a deficient number, since it is larger than the sum of its proper divisors (419414007).

1258242009 is an equidigital number, since it uses as much as digits as its factorization.

1258242009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419414006.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1258242009 is about 35471.7071621877. The cubic root of 1258242009 is about 1079.5797430380.

The spelling of 1258242009 in words is "one billion, two hundred fifty-eight million, two hundred forty-two thousand, nine".