1231185281852 has 24 divisors (see below), whose sum is σ = 2157351555072. Its totient is φ = 614799385200.

The previous prime is 1231185281831. The next prime is 1231185281929. The reversal of 1231185281852 is 2581825811321.

It is a junction number, because it is equal to n+sod(n) for n = 1231185281797 and 1231185281806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20898077 + ... + 20956907.

It is an arithmetic number, because the mean of its divisors is an integer number (89889648128).

Almost surely, 2^{1231185281852} is an apocalyptic number.

It is an amenable number.

1231185281852 is a deficient number, since it is larger than the sum of its proper divisors (926166273220).

1231185281852 is a wasteful number, since it uses less digits than its factorization.

1231185281852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65489 (or 65487 counting only the distinct ones).

The product of its digits is 307200, while the sum is 47.

The spelling of 1231185281852 in words is "one trillion, two hundred thirty-one billion, one hundred eighty-five million, two hundred eighty-one thousand, eight hundred fifty-two".