1091471868 has 48 divisors (see below), whose sum is σ = 2837237760. Its totient is φ = 362860272.

The previous prime is 1091471863. The next prime is 1091471879. The reversal of 1091471868 is 8681741901.

It is a happy number.

1091471868 is a `hidden beast` number, since 10 + 91 + 471 + 86 + 8 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091471861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28171 + ... + 54557.

It is an arithmetic number, because the mean of its divisors is an integer number (59109120).

Almost surely, 2^1091471868 is an apocalyptic number.

1091471868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1091471868 is an abundant number, since it is smaller than the sum of its proper divisors (1745765892).

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

1091471868 is a wasteful number, since it uses less digits than its factorization.

1091471868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26783 (or 26775 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The square root of 1091471868 is about 33037.4313166142. The cubic root of 1091471868 is about 1029.6054881500.

The spelling of 1091471868 in words is "one billion, ninety-one million, four hundred seventy-one thousand, eight hundred sixty-eight".