1231140343 has 8 divisors (see below), whose sum is σ = 1303843968. Its totient is φ = 1160034744.

The previous prime is 1231140329. The next prime is 1231140347. The reversal of 1231140343 is 3430411321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231140343 - 2⁹ = 1231139831 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 (1231140347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397921 + ... + 401002.

It is an arithmetic number, because the mean of its divisors is an integer number (162980496).

Almost surely, 2^1231140343 is an apocalyptic number.

1231140343 is a deficient number, since it is larger than the sum of its proper divisors (72703625).

1231140343 is an equidigital number, since it uses as much as digits as its factorization.

1231140343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799013.

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

The square root of 1231140343 is about 35087.6095367011. The cubic root of 1231140343 is about 1071.7722813880.

Adding to 1231140343 its reverse (3430411321), we get a palindrome (4661551664).

The spelling of 1231140343 in words is "one billion, two hundred thirty-one million, one hundred forty thousand, three hundred forty-three".