1231247461528 has 128 divisors (see below), whose sum is σ = 2742606028800. Its totient is φ = 507237945984.

The previous prime is 1231247461523. The next prime is 1231247461529. The reversal of 1231247461528 is 8251647421321.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231247461523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210863233 + ... + 210869071.

It is an arithmetic number, because the mean of its divisors is an integer number (21426609600).

Almost surely, 2^{1231247461528} 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 1231247461528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1371303014400).

1231247461528 is an abundant number, since it is smaller than the sum of its proper divisors (1511358567272).

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

1231247461528 is a wasteful number, since it uses less digits than its factorization.

1231247461528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7269 (or 7265 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The spelling of 1231247461528 in words is "one trillion, two hundred thirty-one billion, two hundred forty-seven million, four hundred sixty-one thousand, five hundred twenty-eight".