1231230120019 has 2 divisors, whose sum is σ = 1231230120020. Its totient is φ = 1231230120018.

The previous prime is 1231230120011. The next prime is 1231230120053. The reversal of 1231230120019 is 9100210321321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231230120019 - 2³ = 1231230120011 is a prime.

It is a super-2 number, since 2×1231230120019² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231230119975 and 1231230120002.

It is not a weakly prime, because it can be changed into another prime (1231230120011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615615060009 + 615615060010.

It is an arithmetic number, because the mean of its divisors is an integer number (615615060010).

Almost surely, 2^{1231230120019} is an apocalyptic number.

1231230120019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231230120019 is an equidigital number, since it uses as much as digits as its factorization.

1231230120019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 1231230120019 in words is "one trillion, two hundred thirty-one billion, two hundred thirty million, one hundred twenty thousand, nineteen".