1231503121043 has 16 divisors (see below), whose sum is σ = 1339289952000. Its totient is φ = 1125584373024.

The previous prime is 1231503121031. The next prime is 1231503121129. The reversal of 1231503121043 is 3401213051321.

It is a cyclic number.

It is not a de Polignac number, because 1231503121043 - 2⁸ = 1231503120787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231503121943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10604708 + ... + 10720206.

It is an arithmetic number, because the mean of its divisors is an integer number (83705622000).

Almost surely, 2^{1231503121043} is an apocalyptic number.

1231503121043 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1231503121043 is a deficient number, since it is larger than the sum of its proper divisors (107786830957).

1231503121043 is a wasteful number, since it uses less digits than its factorization.

1231503121043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123578.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 1231503121043 its reverse (3401213051321), we get a palindrome (4632716172364).

The spelling of 1231503121043 in words is "one trillion, two hundred thirty-one billion, five hundred three million, one hundred twenty-one thousand, forty-three".