1258320243 has 4 divisors (see below), whose sum is σ = 1677760328. Its totient is φ = 838880160.

The previous prime is 1258320197. The next prime is 1258320251. The reversal of 1258320243 is 3420238521.

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

It is not a de Polignac number, because 1258320243 - 2⁹ = 1258319731 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 1258320243.

It is not an unprimeable number, because it can be changed into a prime (1258320043) 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 in 3 ways as a sum of consecutive naturals, for example, 209720038 + ... + 209720043.

It is an arithmetic number, because the mean of its divisors is an integer number (419440082).

Almost surely, 2^1258320243 is an apocalyptic number.

1258320243 is a deficient number, since it is larger than the sum of its proper divisors (419440085).

1258320243 is an equidigital number, since it uses as much as digits as its factorization.

1258320243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419440084.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1258320243 is about 35472.8099112546. The cubic root of 1258320243 is about 1079.6021176662.

Adding to 1258320243 its reverse (3420238521), we get a palindrome (4678558764).

The spelling of 1258320243 in words is "one billion, two hundred fifty-eight million, three hundred twenty thousand, two hundred forty-three".