1231242201389 has 2 divisors, whose sum is σ = 1231242201390. Its totient is φ = 1231242201388.

The previous prime is 1231242201383. The next prime is 1231242201437. The reversal of 1231242201389 is 9831022421321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1219792131364 + 11450070025 = 1104442^2 + 107005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231242201389 - 2⁴ = 1231242201373 is a prime.

It is a super-3 number, since 3×1231242201389³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231242201383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615621100694 + 615621100695.

It is an arithmetic number, because the mean of its divisors is an integer number (615621100695).

Almost surely, 2^{1231242201389} is an apocalyptic number.

It is an amenable number.

1231242201389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231242201389 is an equidigital number, since it uses as much as digits as its factorization.

1231242201389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 1231242201389 in words is "one trillion, two hundred thirty-one billion, two hundred forty-two million, two hundred one thousand, three hundred eighty-nine".