1231361240256 has 168 divisors, whose sum is σ = 4034154309120. Its totient is φ = 351776595456.

The previous prime is 1231361240233. The next prime is 1231361240293. The reversal of 1231361240256 is 6520421631321.

1231361240256 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 361 + 2 + 40 + 256 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1231361240256.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58965625 + ... + 58986503.

Almost surely, 2^{1231361240256} is an apocalyptic number.

1231361240256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1231361240256 is an abundant number, since it is smaller than the sum of its proper divisors (2802793068864).

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

1231361240256 is a wasteful number, since it uses less digits than its factorization.

1231361240256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35531 (or 35518 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Adding to 1231361240256 its reverse (6520421631321), we get a palindrome (7751782871577).

The spelling of 1231361240256 in words is "one trillion, two hundred thirty-one billion, three hundred sixty-one million, two hundred forty thousand, two hundred fifty-six".