1331144420 has 12 divisors (see below), whose sum is σ = 2795403324. Its totient is φ = 532457760.

The previous prime is 1331144411. The next prime is 1331144429. The reversal of 1331144420 is 244411331.

It is an interprime number because it is at equal distance from previous prime (1331144411) and next prime (1331144429).

It can be written as a sum of positive squares in 2 ways, for example, as 921243904 + 409900516 = 30352^2 + 20246^2 .

It is not an unprimeable number, because it can be changed into a prime (1331144429) 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, 33278591 + ... + 33278630.

It is an arithmetic number, because the mean of its divisors is an integer number (232950277).

Almost surely, 2^1331144420 is an apocalyptic number.

1331144420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331144420 is an abundant number, since it is smaller than the sum of its proper divisors (1464258904).

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

1331144420 is a wasteful number, since it uses less digits than its factorization.

1331144420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66557230 (or 66557228 counting only the distinct ones).

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

The square root of 1331144420 is about 36484.8519251483. The cubic root of 1331144420 is about 1100.0397836851.

Adding to 1331144420 its reverse (244411331), we get a palindrome (1575555751).

The spelling of 1331144420 in words is "one billion, three hundred thirty-one million, one hundred forty-four thousand, four hundred twenty".