1231430351309 has 2 divisors, whose sum is σ = 1231430351310. Its totient is φ = 1231430351308.

The previous prime is 1231430351303. The next prime is 1231430351363. The reversal of 1231430351309 is 9031530341321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1065498772900 + 165931578409 = 1032230^2 + 407347^2 .

It is an emirp because it is prime and its reverse (9031530341321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231430351309 - 2¹⁶ = 1231430285773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231430351303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615715175654 + 615715175655.

It is an arithmetic number, because the mean of its divisors is an integer number (615715175655).

Almost surely, 2^{1231430351309} is an apocalyptic number.

It is an amenable number.

1231430351309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231430351309 is an equidigital number, since it uses as much as digits as its factorization.

1231430351309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 35.

The spelling of 1231430351309 in words is "one trillion, two hundred thirty-one billion, four hundred thirty million, three hundred fifty-one thousand, three hundred nine".