1131231021251 has 8 divisors (see below), whose sum is σ = 1155383792640. Its totient is φ = 1107081751048.

The previous prime is 1131231021223. The next prime is 1131231021299. The reversal of 1131231021251 is 1521201321311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131231021251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131231021451) by changing a digit.

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, 216971 + ... + 1519716.

It is an arithmetic number, because the mean of its divisors is an integer number (144422974080).

Almost surely, 2^{1131231021251} is an apocalyptic number.

1131231021251 is a deficient number, since it is larger than the sum of its proper divisors (24152771389).

1131231021251 is a wasteful number, since it uses less digits than its factorization.

1131231021251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750593.

The product of its (nonzero) digits is 360, while the sum is 23.

Adding to 1131231021251 its reverse (1521201321311), we get a palindrome (2652432342562).

The spelling of 1131231021251 in words is "one trillion, one hundred thirty-one billion, two hundred thirty-one million, twenty-one thousand, two hundred fifty-one".