1091645648 has 10 divisors (see below), whose sum is σ = 2115063474. Its totient is φ = 545822816.

The previous prime is 1091645647. The next prime is 1091645651. The reversal of 1091645648 is 8465461901.

It can be written as a sum of positive squares in only one way, i.e., 964226704 + 127418944 = 31052^2 + 11288^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1091645599 and 1091645608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091645647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34113911 + ... + 34113942.

Almost surely, 2^1091645648 is an apocalyptic number.

It is an amenable number.

1091645648 is a deficient number, since it is larger than the sum of its proper divisors (1023417826).

1091645648 is an equidigital number, since it uses as much as digits as its factorization.

1091645648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68227861 (or 68227855 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 1091645648 is about 33040.0612590231. The cubic root of 1091645648 is about 1029.6601285403.

The spelling of 1091645648 in words is "one billion, ninety-one million, six hundred forty-five thousand, six hundred forty-eight".