1231355105047 has 2 divisors, whose sum is σ = 1231355105048. Its totient is φ = 1231355105046.

The previous prime is 1231355104957. The next prime is 1231355105081. The reversal of 1231355105047 is 7405015531321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231355105047 - 2¹⁹ = 1231354580759 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231355104997 and 1231355105015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231355105087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615677552523 + 615677552524.

It is an arithmetic number, because the mean of its divisors is an integer number (615677552524).

Almost surely, 2^{1231355105047} is an apocalyptic number.

1231355105047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231355105047 is an equidigital number, since it uses as much as digits as its factorization.

1231355105047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 37.

The spelling of 1231355105047 in words is "one trillion, two hundred thirty-one billion, three hundred fifty-five million, one hundred five thousand, forty-seven".