1243320231 has 4 divisors (see below), whose sum is σ = 1657760312. Its totient is φ = 828880152.

The previous prime is 1243320229. The next prime is 1243320241. The reversal of 1243320231 is 1320233421.

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

It is not a de Polignac number, because 1243320231 - 2¹ = 1243320229 is a prime.

It is a super-2 number, since 2×1243320231² = 3091690393627786722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1243320198 and 1243320207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243320241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207220036 + ... + 207220041.

It is an arithmetic number, because the mean of its divisors is an integer number (414440078).

Almost surely, 2^1243320231 is an apocalyptic number.

1243320231 is a deficient number, since it is larger than the sum of its proper divisors (414440081).

1243320231 is an equidigital number, since it uses as much as digits as its factorization.

1243320231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414440080.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1243320231 is about 35260.7463193847. The cubic root of 1243320231 is about 1075.2951000911.

Adding to 1243320231 its reverse (1320233421), we get a palindrome (2563553652).

The spelling of 1243320231 in words is "one billion, two hundred forty-three million, three hundred twenty thousand, two hundred thirty-one".