1331240144 has 20 divisors (see below), whose sum is σ = 2777684196. Its totient is φ = 614418432.

The previous prime is 1331240143. The next prime is 1331240147. The reversal of 1331240144 is 4410421331.

It can be written as a sum of positive squares in 2 ways, for example, as 873793600 + 457446544 = 29560^2 + 21388^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331240143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3199889 + ... + 3200304.

Almost surely, 2^1331240144 is an apocalyptic number.

It is an amenable number.

1331240144 is an abundant number, since it is smaller than the sum of its proper divisors (1446444052).

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

1331240144 is a wasteful number, since it uses less digits than its factorization.

1331240144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6400214 (or 6400208 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1331240144 is about 36486.1637336676. The cubic root of 1331240144 is about 1100.0661513936.

Adding to 1331240144 its reverse (4410421331), we get a palindrome (5741661475).

The spelling of 1331240144 in words is "one billion, three hundred thirty-one million, two hundred forty thousand, one hundred forty-four".