1331561144 has 32 divisors (see below), whose sum is σ = 2512615680. Its totient is φ = 661546464.

The previous prime is 1331561123. The next prime is 1331561171. The reversal of 1331561144 is 4411651331.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1018139 + ... + 1019445.

It is an arithmetic number, because the mean of its divisors is an integer number (78519240).

Almost surely, 2^1331561144 is an apocalyptic number.

It is an amenable number.

1331561144 is a deficient number, since it is larger than the sum of its proper divisors (1181054536).

1331561144 is a wasteful number, since it uses less digits than its factorization.

1331561144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027 (or 2023 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 1331561144 is about 36490.5623963238. The cubic root of 1331561144 is about 1100.1545634049.

The spelling of 1331561144 in words is "one billion, three hundred thirty-one million, five hundred sixty-one thousand, one hundred forty-four".