1231510741728 has 48 divisors (see below), whose sum is σ = 3271664100096. Its totient is φ = 405557751680.

The previous prime is 1231510741711. The next prime is 1231510741733. The reversal of 1231510741728 is 8271470151321.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1231510741728.

It is a congruent 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, 77270568 + ... + 77286503.

It is an arithmetic number, because the mean of its divisors is an integer number (68159668752).

Almost surely, 2^{1231510741728} is an apocalyptic number.

It is an amenable number.

1231510741728 is an abundant number, since it is smaller than the sum of its proper divisors (2040153358368).

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

1231510741728 is a wasteful number, since it uses less digits than its factorization.

1231510741728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154557167 (or 154557159 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 42.

The spelling of 1231510741728 in words is "one trillion, two hundred thirty-one billion, five hundred ten million, seven hundred forty-one thousand, seven hundred twenty-eight".