1231423355345 has 16 divisors (see below), whose sum is σ = 1478713525200. Its totient is φ = 984468578304.

The previous prime is 1231423355341. The next prime is 1231423355353. The reversal of 1231423355345 is 5435533241321.

It can be written as a sum of positive squares in 8 ways, for example, as 174195212689 + 1057228142656 = 417367^2 + 1028216^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231423355345 - 2² = 1231423355341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231423355341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59053481 + ... + 59074329.

It is an arithmetic number, because the mean of its divisors is an integer number (92419595325).

Almost surely, 2^{1231423355345} is an apocalyptic number.

It is an amenable number.

1231423355345 is a deficient number, since it is larger than the sum of its proper divisors (247290169855).

1231423355345 is a wasteful number, since it uses less digits than its factorization.

1231423355345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28324.

The product of its digits is 648000, while the sum is 41.

Adding to 1231423355345 its reverse (5435533241321), we get a palindrome (6666956596666).

The spelling of 1231423355345 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-three million, three hundred fifty-five thousand, three hundred forty-five".