1231121343 has 4 divisors (see below), whose sum is σ = 1641495128. Its totient is φ = 820747560.

The previous prime is 1231121341. The next prime is 1231121357. The reversal of 1231121343 is 3431211321.

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

It is not a de Polignac number, because 1231121343 - 2¹ = 1231121341 is a prime.

It is a super-2 number, since 2×1231121343² = 3031319522380247298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231121341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205186888 + ... + 205186893.

It is an arithmetic number, because the mean of its divisors is an integer number (410373782).

Almost surely, 2^1231121343 is an apocalyptic number.

1231121343 is a deficient number, since it is larger than the sum of its proper divisors (410373785).

1231121343 is an equidigital number, since it uses as much as digits as its factorization.

1231121343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410373784.

The product of its digits is 432, while the sum is 21.

The square root of 1231121343 is about 35087.3387848095. The cubic root of 1231121343 is about 1071.7667678606.

Adding to 1231121343 its reverse (3431211321), we get a palindrome (4662332664).

The spelling of 1231121343 in words is "one billion, two hundred thirty-one million, one hundred twenty-one thousand, three hundred forty-three".