1231387433935 has 16 divisors (see below), whose sum is σ = 1500263493120. Its totient is φ = 970077314080.

The previous prime is 1231387433933. The next prime is 1231387433953. The reversal of 1231387433935 is 5393347831321.

It is not a de Polignac number, because 1231387433935 - 2¹ = 1231387433933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231387433933) 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, 1769317 + ... + 2365006.

It is an arithmetic number, because the mean of its divisors is an integer number (93766468320).

Almost surely, 2^{1231387433935} is an apocalyptic number.

1231387433935 is a deficient number, since it is larger than the sum of its proper divisors (268876059185).

1231387433935 is an equidigital number, since it uses as much as digits as its factorization.

1231387433935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4135238.

The product of its digits is 4898880, while the sum is 52.

The spelling of 1231387433935 in words is "one trillion, two hundred thirty-one billion, three hundred eighty-seven million, four hundred thirty-three thousand, nine hundred thirty-five".