1231870611312 has 240 divisors, whose sum is σ = 4129660184832. Its totient is φ = 351335439360.

The previous prime is 1231870611253. The next prime is 1231870611383. The reversal of 1231870611312 is 2131160781321.

1231870611312 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 8 + 7 + 0 + 611 + 31 + 2 = 666.

It is a super-2 number, since 2×1231870611312² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120108 + ... + 1574219.

Almost surely, 2^{1231870611312} is an apocalyptic number.

1231870611312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231870611312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2064830092416).

1231870611312 is an abundant number, since it is smaller than the sum of its proper divisors (2897789573520).

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

1231870611312 is a wasteful number, since it uses less digits than its factorization.

1231870611312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694378 (or 1694360 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 1231870611312 in words is "one trillion, two hundred thirty-one billion, eight hundred seventy million, six hundred eleven thousand, three hundred twelve".