1331561948 has 12 divisors (see below), whose sum is σ = 2331175392. Its totient is φ = 665511840.

The previous prime is 1331561947. The next prime is 1331561993. The reversal of 1331561948 is 8491651331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331561947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55940 + ... + 76107.

It is an arithmetic number, because the mean of its divisors is an integer number (194264616).

Almost surely, 2^1331561948 is an apocalyptic number.

It is an amenable number.

1331561948 is a deficient number, since it is larger than the sum of its proper divisors (999613444).

1331561948 is a wasteful number, since it uses less digits than its factorization.

1331561948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134572 (or 134570 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 1331561948 is about 36490.5734128692. The cubic root of 1331561948 is about 1100.1547848302.

The spelling of 1331561948 in words is "one billion, three hundred thirty-one million, five hundred sixty-one thousand, nine hundred forty-eight".