1081781645 has 8 divisors (see below), whose sum is σ = 1483586304. Its totient is φ = 741793104.

The previous prime is 1081781639. The next prime is 1081781647. The reversal of 1081781645 is 5461871801.

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 1081781645 - 2¹⁴ = 1081765261 is a prime.

It is a super-3 number, since 3×1081781645³ (a number of 28 digits) contains 333 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 (1081781647) 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, 15453989 + ... + 15454058.

It is an arithmetic number, because the mean of its divisors is an integer number (185448288).

Almost surely, 2^1081781645 is an apocalyptic number.

It is an amenable number.

1081781645 is a deficient number, since it is larger than the sum of its proper divisors (401804659).

1081781645 is an equidigital number, since it uses as much as digits as its factorization.

1081781645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30908059.

The product of its (nonzero) digits is 53760, while the sum is 41.

The square root of 1081781645 is about 32890.4491456106. The cubic root of 1081781645 is about 1026.5494377004.

The spelling of 1081781645 in words is "one billion, eighty-one million, seven hundred eighty-one thousand, six hundred forty-five".