1321697616 has 20 divisors (see below), whose sum is σ = 3414385632. Its totient is φ = 440565856.

The previous prime is 1321697569. The next prime is 1321697639. The reversal of 1321697616 is 6167961231.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13767636 + ... + 13767731.

Almost surely, 2^1321697616 is an apocalyptic number.

1321697616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1321697616 is an abundant number, since it is smaller than the sum of its proper divisors (2092688016).

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

1321697616 is a wasteful number, since it uses less digits than its factorization.

1321697616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27535378 (or 27535372 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The square root of 1321697616 is about 36355.1594137613. The cubic root of 1321697616 is about 1097.4313663768.

The spelling of 1321697616 in words is "one billion, three hundred twenty-one million, six hundred ninety-seven thousand, six hundred sixteen".