1091645618 has 24 divisors (see below), whose sum is σ = 1909129500. Its totient is φ = 466787328.

The previous prime is 1091645617. The next prime is 1091645647. The reversal of 1091645618 is 8165461901.

It can be written as a sum of positive squares in 2 ways, for example, as 1013976649 + 77668969 = 31843^2 + 8813^2 .

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 11 ways as a sum of consecutive naturals, for example, 31598 + ... + 56406.

Almost surely, 2^1091645618 is an apocalyptic number.

1091645618 is a deficient number, since it is larger than the sum of its proper divisors (817483882).

1091645618 is a wasteful number, since it uses less digits than its factorization.

1091645618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25274 (or 25267 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 1091645618 is about 33040.0608050288. The cubic root of 1091645618 is about 1029.6601191081.

The spelling of 1091645618 in words is "one billion, ninety-one million, six hundred forty-five thousand, six hundred eighteen".