1231778759903 has 2 divisors, whose sum is σ = 1231778759904. Its totient is φ = 1231778759902.

The previous prime is 1231778759899. The next prime is 1231778759923. The reversal of 1231778759903 is 3099578771321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231778759903 - 2² = 1231778759899 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231778759923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615889379951 + 615889379952.

It is an arithmetic number, because the mean of its divisors is an integer number (615889379952).

Almost surely, 2^{1231778759903} is an apocalyptic number.

1231778759903 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231778759903 is an equidigital number, since it uses as much as digits as its factorization.

1231778759903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20003760, while the sum is 62.

The spelling of 1231778759903 in words is "one trillion, two hundred thirty-one billion, seven hundred seventy-eight million, seven hundred fifty-nine thousand, nine hundred three".