1091489663 has 4 divisors (see below), whose sum is σ = 1190716008. Its totient is φ = 992263320.

The previous prime is 1091489657. The next prime is 1091489671. The reversal of 1091489663 is 3669841901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1091489663 - 2⁸ = 1091489407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091489263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49613156 + ... + 49613177.

It is an arithmetic number, because the mean of its divisors is an integer number (297679002).

Almost surely, 2^1091489663 is an apocalyptic number.

1091489663 is a deficient number, since it is larger than the sum of its proper divisors (99226345).

1091489663 is an equidigital number, since it uses as much as digits as its factorization.

1091489663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99226344.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1091489663 is about 33037.7006312485. The cubic root of 1091489663 is about 1029.6110835699.

It can be divided in two parts, 109148 and 9663, that added together give a palindrome (118811).

The spelling of 1091489663 in words is "one billion, ninety-one million, four hundred eighty-nine thousand, six hundred sixty-three".