1320551144 has 64 divisors (see below), whose sum is σ = 2797977600. Its totient is φ = 578865600.

The previous prime is 1320551101. The next prime is 1320551147. The reversal of 1320551144 is 4411550231.

It is not an unprimeable number, because it can be changed into a prime (1320551147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1000517 + ... + 1001835.

It is an arithmetic number, because the mean of its divisors is an integer number (43718400).

Almost surely, 2^1320551144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1320551144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1398988800).

1320551144 is an abundant number, since it is smaller than the sum of its proper divisors (1477426456).

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

1320551144 is a wasteful number, since it uses less digits than its factorization.

1320551144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734 (or 1730 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1320551144 is about 36339.3883272683. The cubic root of 1320551144 is about 1097.1139618803.

The spelling of 1320551144 in words is "one billion, three hundred twenty million, five hundred fifty-one thousand, one hundred forty-four".