1231230252540 has 48 divisors (see below), whose sum is σ = 3481577840160. Its totient is φ = 325077292800.

The previous prime is 1231230252533. The next prime is 1231230252547. The reversal of 1231230252540 is 452520321321.

It is an interprime number because it is at equal distance from previous prime (1231230252533) and next prime (1231230252547).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1231230252498 and 1231230252507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231230252547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101580595 + ... + 101592714.

It is an arithmetic number, because the mean of its divisors is an integer number (72532871670).

Almost surely, 2^{1231230252540} is an apocalyptic number.

1231230252540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231230252540 is an abundant number, since it is smaller than the sum of its proper divisors (2250347587620).

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

1231230252540 is a wasteful number, since it uses less digits than its factorization.

1231230252540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203173422 (or 203173420 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 1231230252540 its reverse (452520321321), we get a palindrome (1683750573861).

The spelling of 1231230252540 in words is "one trillion, two hundred thirty-one billion, two hundred thirty million, two hundred fifty-two thousand, five hundred forty".