1081791823 has 4 divisors (see below), whose sum is σ = 1236333520. Its totient is φ = 927250128.

The previous prime is 1081791811. The next prime is 1081791857. The reversal of 1081791823 is 3281971801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3281971801 = 1543 ⋅2127007.

It is not a de Polignac number, because 1081791823 - 2⁵ = 1081791791 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 (1081791803) 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, 77270838 + ... + 77270851.

It is an arithmetic number, because the mean of its divisors is an integer number (309083380).

Almost surely, 2^1081791823 is an apocalyptic number.

1081791823 is a deficient number, since it is larger than the sum of its proper divisors (154541697).

1081791823 is an equidigital number, since it uses as much as digits as its factorization.

1081791823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154541696.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 1081791823 is about 32890.6038710146. The cubic root of 1081791823 is about 1026.5526571385.

The spelling of 1081791823 in words is "one billion, eighty-one million, seven hundred ninety-one thousand, eight hundred twenty-three".