1231526720980 has 12 divisors (see below), whose sum is σ = 2586206114100. Its totient is φ = 492610688384.

The previous prime is 1231526720969. The next prime is 1231526720999. The reversal of 1231526720980 is 890276251321.

It can be written as a sum of positive squares in 2 ways, for example, as 143832079504 + 1087694641476 = 379252^2 + 1042926^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1231526720980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30788168005 + ... + 30788168044.

It is an arithmetic number, because the mean of its divisors is an integer number (215517176175).

Almost surely, 2^{1231526720980} is an apocalyptic number.

1231526720980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231526720980 is an abundant number, since it is smaller than the sum of its proper divisors (1354679393120).

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

1231526720980 is a wasteful number, since it uses less digits than its factorization.

1231526720980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61576336058 (or 61576336056 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 1231526720980 in words is "one trillion, two hundred thirty-one billion, five hundred twenty-six million, seven hundred twenty thousand, nine hundred eighty".