1086821791 has 16 divisors (see below), whose sum is σ = 1199899008. Its totient is φ = 976175200.

The previous prime is 1086821789. The next prime is 1086821803. The reversal of 1086821791 is 1971286801.

It is a happy number.

It is not a de Polignac number, because 1086821791 - 2¹ = 1086821789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1086821731) 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, 541596 + ... + 543598.

It is an arithmetic number, because the mean of its divisors is an integer number (74993688).

Almost surely, 2^1086821791 is an apocalyptic number.

1086821791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1086821791 is a deficient number, since it is larger than the sum of its proper divisors (113077217).

1086821791 is a wasteful number, since it uses less digits than its factorization.

1086821791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582.

The product of its (nonzero) digits is 48384, while the sum is 43.

The square root of 1086821791 is about 32966.9803136411. The cubic root of 1086821791 is about 1028.1412390410.

The spelling of 1086821791 in words is "one billion, eighty-six million, eight hundred twenty-one thousand, seven hundred ninety-one".