1231334643 has 32 divisors (see below), whose sum is σ = 2077470720. Its totient is φ = 630099360.

The previous prime is 1231334639. The next prime is 1231334677. The reversal of 1231334643 is 3464331321.

1231334643 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1231334643 - 2² = 1231334639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231334643.

It is not an unprimeable number, because it can be changed into a prime (1231334243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24303 + ... + 55256.

It is an arithmetic number, because the mean of its divisors is an integer number (64920960).

Almost surely, 2^1231334643 is an apocalyptic number.

1231334643 is a deficient number, since it is larger than the sum of its proper divisors (846136077).

1231334643 is a wasteful number, since it uses less digits than its factorization.

1231334643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79647.

The product of its digits is 15552, while the sum is 30.

The square root of 1231334643 is about 35090.3782111279. The cubic root of 1231334643 is about 1071.8286612045.

Adding to 1231334643 its reverse (3464331321), we get a palindrome (4695665964).

The spelling of 1231334643 in words is "one billion, two hundred thirty-one million, three hundred thirty-four thousand, six hundred forty-three".