1231297656120 has 192 divisors, whose sum is σ = 4631283072000. Its totient is φ = 277876894464.

The previous prime is 1231297656059. The next prime is 1231297656163. The reversal of 1231297656120 is 216567921321.

1231297656120 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 29 + 7 + 6 + 5 + 612 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 2893390 + ... + 3291549.

It is an arithmetic number, because the mean of its divisors is an integer number (24121266000).

Almost surely, 2^{1231297656120} is an apocalyptic number.

1231297656120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231297656120 is an abundant number, since it is smaller than the sum of its proper divisors (3399985415880).

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

1231297656120 is a wasteful number, since it uses less digits than its factorization.

1231297656120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6185042 (or 6185035 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 1231297656120 in words is "one trillion, two hundred thirty-one billion, two hundred ninety-seven million, six hundred fifty-six thousand, one hundred twenty".