1013256243 has 8 divisors (see below), whose sum is σ = 1501120400. Its totient is φ = 675504144.

The previous prime is 1013256241. The next prime is 1013256269. The reversal of 1013256243 is 3426523101.

1013256243 is a `hidden beast` number, since 1 + 0 + 1 + 32 + 5 + 624 + 3 = 666.

It is not a de Polignac number, because 1013256243 - 2¹ = 1013256241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 37528009 = 1013256243 / (1 + 0 + 1 + 3 + 2 + 5 + 6 + 2 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1013256241) 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 7 ways as a sum of consecutive naturals, for example, 18763978 + ... + 18764031.

It is an arithmetic number, because the mean of its divisors is an integer number (187640050).

Almost surely, 2^1013256243 is an apocalyptic number.

1013256243 is a deficient number, since it is larger than the sum of its proper divisors (487864157).

1013256243 is an equidigital number, since it uses as much as digits as its factorization.

1013256243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37528018 (or 37528012 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1013256243 is about 31831.6861476108. The cubic root of 1013256243 is about 1004.3993648730.

Adding to 1013256243 its reverse (3426523101), we get a palindrome (4439779344).

The spelling of 1013256243 in words is "one billion, thirteen million, two hundred fifty-six thousand, two hundred forty-three".