1231440047 has 2 divisors, whose sum is σ = 1231440048. Its totient is φ = 1231440046.

The previous prime is 1231440037. The next prime is 1231440053. The reversal of 1231440047 is 7400441321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231440047 - 2⁶ = 1231439983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231439998 and 1231440025.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231440037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615720023 + 615720024.

It is an arithmetic number, because the mean of its divisors is an integer number (615720024).

Almost surely, 2^1231440047 is an apocalyptic number.

1231440047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231440047 is an equidigital number, since it uses as much as digits as its factorization.

1231440047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 1231440047 is about 35091.8800721762. The cubic root of 1231440047 is about 1071.8592436855.

Adding to 1231440047 its reverse (7400441321), we get a palindrome (8631881368).

The spelling of 1231440047 in words is "one billion, two hundred thirty-one million, four hundred forty thousand, forty-seven".