1231401451728 has 160 divisors (see below), whose sum is σ = 3716286745600. Its totient is φ = 351210142080.

The previous prime is 1231401451723. The next prime is 1231401451769. The reversal of 1231401451728 is 8271541041321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231401451723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9335451 + ... + 9466437.

It is an arithmetic number, because the mean of its divisors is an integer number (23226792160).

Almost surely, 2^{1231401451728} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231401451728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1858143372800).

1231401451728 is an abundant number, since it is smaller than the sum of its proper divisors (2484885293872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231401451728 is a wasteful number, since it uses less digits than its factorization.

1231401451728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131590 (or 131570 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The spelling of 1231401451728 in words is "one trillion, two hundred thirty-one billion, four hundred one million, four hundred fifty-one thousand, seven hundred twenty-eight".