1231265343 has 16 divisors (see below), whose sum is σ = 2046779136. Its totient is φ = 639618240.

The previous prime is 1231265339. The next prime is 1231265353. The reversal of 1231265343 is 3435621321.

It is not a de Polignac number, because 1231265343 - 2² = 1231265339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231265343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231265353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2664846 + ... + 2665307.

It is an arithmetic number, because the mean of its divisors is an integer number (127923696).

Almost surely, 2^1231265343 is an apocalyptic number.

1231265343 is a deficient number, since it is larger than the sum of its proper divisors (815513793).

1231265343 is a wasteful number, since it uses less digits than its factorization.

1231265343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5330174.

The product of its digits is 12960, while the sum is 30.

The square root of 1231265343 is about 35089.3907470620. The cubic root of 1231265343 is about 1071.8085531805.

Adding to 1231265343 its reverse (3435621321), we get a palindrome (4666886664).

The spelling of 1231265343 in words is "one billion, two hundred thirty-one million, two hundred sixty-five thousand, three hundred forty-three".