1063188991 has 4 divisors (see below), whose sum is σ = 1063287472. Its totient is φ = 1063090512.

The previous prime is 1063188983. The next prime is 1063189033. The reversal of 1063188991 is 1998813601.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1063188991 - 2³ = 1063188983 is a prime.

It is a super-2 number, since 2×1063188991² = 2260741661167196162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1063188901) 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, 30726 + ... + 55411.

It is an arithmetic number, because the mean of its divisors is an integer number (265821868).

Almost surely, 2^1063188991 is an apocalyptic number.

1063188991 is a deficient number, since it is larger than the sum of its proper divisors (98481).

1063188991 is an equidigital number, since it uses as much as digits as its factorization.

1063188991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98480.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 1063188991 is about 32606.5789527206. The cubic root of 1063188991 is about 1020.6342943794.

The spelling of 1063188991 in words is "one billion, sixty-three million, one hundred eighty-eight thousand, nine hundred ninety-one".