1231213203089 has 2 divisors, whose sum is σ = 1231213203090. Its totient is φ = 1231213203088.

The previous prime is 1231213203083. The next prime is 1231213203133. The reversal of 1231213203089 is 9803023121321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1017459550864 + 213753652225 = 1008692^2 + 462335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231213203089 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1231213203083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615606601544 + 615606601545.

It is an arithmetic number, because the mean of its divisors is an integer number (615606601545).

Almost surely, 2^{1231213203089} is an apocalyptic number.

It is an amenable number.

1231213203089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231213203089 is an equidigital number, since it uses as much as digits as its factorization.

1231213203089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 1231213203089 in words is "one trillion, two hundred thirty-one billion, two hundred thirteen million, two hundred three thousand, eighty-nine".