1243013143 has 4 divisors (see below), whose sum is σ = 1245608640. Its totient is φ = 1240417648.

The previous prime is 1243013137. The next prime is 1243013147. The reversal of 1243013143 is 3413103421.

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

It is a cyclic number.

It is not a de Polignac number, because 1243013143 - 2²⁵ = 1209458711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243013147) 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, 1297030 + ... + 1297987.

It is an arithmetic number, because the mean of its divisors is an integer number (311402160).

Almost surely, 2^1243013143 is an apocalyptic number.

1243013143 is a deficient number, since it is larger than the sum of its proper divisors (2595497).

1243013143 is an equidigital number, since it uses as much as digits as its factorization.

1243013143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595496.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1243013143 is about 35256.3915198365. The cubic root of 1243013143 is about 1075.2065636590.

Adding to 1243013143 its reverse (3413103421), we get a palindrome (4656116564).

The spelling of 1243013143 in words is "one billion, two hundred forty-three million, thirteen thousand, one hundred forty-three".