1231383243 has 4 divisors (see below), whose sum is σ = 1641844328. Its totient is φ = 820922160.

The previous prime is 1231383227. The next prime is 1231383259. The reversal of 1231383243 is 3423831321.

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

It is an interprime number because it is at equal distance from previous prime (1231383227) and next prime (1231383259).

It is not a de Polignac number, because 1231383243 - 2⁴ = 1231383227 is a prime.

It is a super-2 number, since 2×1231383243² = 3032609382282394098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231383243.

It is not an unprimeable number, because it can be changed into a prime (1231383203) 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, 205230538 + ... + 205230543.

It is an arithmetic number, because the mean of its divisors is an integer number (410461082).

Almost surely, 2^1231383243 is an apocalyptic number.

1231383243 is a deficient number, since it is larger than the sum of its proper divisors (410461085).

1231383243 is an equidigital number, since it uses as much as digits as its factorization.

1231383243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410461084.

The product of its digits is 10368, while the sum is 30.

The square root of 1231383243 is about 35091.0707018181. The cubic root of 1231383243 is about 1071.8427624856.

The spelling of 1231383243 in words is "one billion, two hundred thirty-one million, three hundred eighty-three thousand, two hundred forty-three".