1231131233309 has 2 divisors, whose sum is σ = 1231131233310. Its totient is φ = 1231131233308.

The previous prime is 1231131233257. The next prime is 1231131233341. The reversal of 1231131233309 is 9033321311321.

It is an a-pointer prime, because the next prime (1231131233341) can be obtained adding 1231131233309 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1086576912100 + 144554321209 = 1042390^2 + 380203^2 .

It is an emirp because it is prime and its reverse (9033321311321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231131233309 - 2¹² = 1231131229213 is a prime.

It is a super-2 number, since 2×1231131233309² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231131233209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615565616654 + 615565616655.

It is an arithmetic number, because the mean of its divisors is an integer number (615565616655).

Almost surely, 2^{1231131233309} is an apocalyptic number.

It is an amenable number.

1231131233309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231131233309 is an equidigital number, since it uses as much as digits as its factorization.

1231131233309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 32.

The spelling of 1231131233309 in words is "one trillion, two hundred thirty-one billion, one hundred thirty-one million, two hundred thirty-three thousand, three hundred nine".