1231719229656 has 128 divisors (see below), whose sum is σ = 3539448422400. Its totient is φ = 396469624320.

The previous prime is 1231719229651. The next prime is 1231719229673. The reversal of 1231719229656 is 6569229171321.

1231719229656 is a `hidden beast` number, since 1 + 2 + 317 + 192 + 2 + 96 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231719229651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2901600 + ... + 3298896.

It is an arithmetic number, because the mean of its divisors is an integer number (27651940800).

Almost surely, 2^{1231719229656} 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 1231719229656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1769724211200).

1231719229656 is an abundant number, since it is smaller than the sum of its proper divisors (2307729192744).

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

1231719229656 is a wasteful number, since it uses less digits than its factorization.

1231719229656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397806 (or 397796 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The spelling of 1231719229656 in words is "one trillion, two hundred thirty-one billion, seven hundred nineteen million, two hundred twenty-nine thousand, six hundred fifty-six".