1231531117446 has 64 divisors (see below), whose sum is σ = 2963233566720. Its totient is φ = 333329761440.

The previous prime is 1231531117403. The next prime is 1231531117469. The reversal of 1231531117446 is 6447111351321.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 29338245 + ... + 29380191.

It is an arithmetic number, because the mean of its divisors is an integer number (46300524480).

Almost surely, 2^{1231531117446} is an apocalyptic number.

1231531117446 is an abundant number, since it is smaller than the sum of its proper divisors (1731702449274).

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

1231531117446 is a wasteful number, since it uses less digits than its factorization.

1231531117446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78769.

The product of its digits is 60480, while the sum is 39.

Adding to 1231531117446 its reverse (6447111351321), we get a palindrome (7678642468767).

The spelling of 1231531117446 in words is "one trillion, two hundred thirty-one billion, five hundred thirty-one million, one hundred seventeen thousand, four hundred forty-six".