1091645616 has 40 divisors (see below), whose sum is σ = 2985974064. Its totient is φ = 342476800.

The previous prime is 1091645593. The next prime is 1091645617. The reversal of 1091645616 is 6165461901.

It is not an unprimeable number, because it can be changed into a prime (1091645617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 668085 + ... + 669716.

Almost surely, 2^1091645616 is an apocalyptic number.

1091645616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1091645616 is an abundant number, since it is smaller than the sum of its proper divisors (1894328448).

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

1091645616 is a wasteful number, since it uses less digits than its factorization.

1091645616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337829 (or 1337823 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 1091645616 is about 33040.0607747625. The cubic root of 1091645616 is about 1029.6601184793.

The spelling of 1091645616 in words is "one billion, ninety-one million, six hundred forty-five thousand, six hundred sixteen".