1321654516 has 192 divisors, whose sum is σ = 3161088000. Its totient is φ = 469048320.

The previous prime is 1321654513. The next prime is 1321654517. The reversal of 1321654516 is 6154561231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321654513) 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 63 ways as a sum of consecutive naturals, for example, 16729765 + ... + 16729843.

It is an arithmetic number, because the mean of its divisors is an integer number (16464000).

Almost surely, 2^1321654516 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 1321654516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1580544000).

1321654516 is an abundant number, since it is smaller than the sum of its proper divisors (1839433484).

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

1321654516 is a wasteful number, since it uses less digits than its factorization.

1321654516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 220 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 1321654516 is about 36354.5666457462. The cubic root of 1321654516 is about 1097.4194373230.

The spelling of 1321654516 in words is "one billion, three hundred twenty-one million, six hundred fifty-four thousand, five hundred sixteen".