1243243011 has 4 divisors (see below), whose sum is σ = 1657657352. Its totient is φ = 828828672.

The previous prime is 1243243009. The next prime is 1243243039. The reversal of 1243243011 is 1103423421.

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

It is not a de Polignac number, because 1243243011 - 2¹ = 1243243009 is a prime.

It is a super-2 number, since 2×1243243011² = 3091306368800692242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243244011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207207166 + ... + 207207171.

It is an arithmetic number, because the mean of its divisors is an integer number (414414338).

Almost surely, 2^1243243011 is an apocalyptic number.

1243243011 is a deficient number, since it is larger than the sum of its proper divisors (414414341).

1243243011 is an equidigital number, since it uses as much as digits as its factorization.

1243243011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414414340.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1243243011 is about 35259.6513170508. The cubic root of 1243243011 is about 1075.2728381925.

Adding to 1243243011 its reverse (1103423421), we get a palindrome (2346666432).

The spelling of 1243243011 in words is "one billion, two hundred forty-three million, two hundred forty-three thousand, eleven".