1081790821 has 8 divisors (see below), whose sum is σ = 1139501600. Its totient is φ = 1024157520.

The previous prime is 1081790813. The next prime is 1081790837. The reversal of 1081790821 is 1280971801.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1081790821 - 2³ = 1081790813 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 (1081790221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10495 + ... + 47683.

It is an arithmetic number, because the mean of its divisors is an integer number (142437700).

Almost surely, 2^1081790821 is an apocalyptic number.

It is an amenable number.

1081790821 is a deficient number, since it is larger than the sum of its proper divisors (57710779).

1081790821 is a wasteful number, since it uses less digits than its factorization.

1081790821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38739.

The product of its (nonzero) digits is 8064, while the sum is 37.

The square root of 1081790821 is about 32890.5886386972. The cubic root of 1081790821 is about 1026.5523401934.

The spelling of 1081790821 in words is "one billion, eighty-one million, seven hundred ninety thousand, eight hundred twenty-one".