1231341231545 has 8 divisors (see below), whose sum is σ = 1477631284296. Its totient is φ = 985058447616.

The previous prime is 1231341231521. The next prime is 1231341231557. The reversal of 1231341231545 is 5451321431321.

It can be written as a sum of positive squares in 4 ways, for example, as 497267549584 + 734073681961 = 705172^2 + 856781^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231341231545 - 2¹⁶ = 1231341166009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1437302 + ... + 2128031.

It is an arithmetic number, because the mean of its divisors is an integer number (184703910537).

Almost surely, 2^{1231341231545} is an apocalyptic number.

It is an amenable number.

1231341231545 is a deficient number, since it is larger than the sum of its proper divisors (246290052751).

1231341231545 is an equidigital number, since it uses as much as digits as its factorization.

1231341231545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3634411.

The product of its digits is 43200, while the sum is 35.

Adding to 1231341231545 its reverse (5451321431321), we get a palindrome (6682662662866).

The spelling of 1231341231545 in words is "one trillion, two hundred thirty-one billion, three hundred forty-one million, two hundred thirty-one thousand, five hundred forty-five".