1081644775 has 12 divisors (see below), whose sum is σ = 1347260992. Its totient is φ = 861431040.

The previous prime is 1081644757. The next prime is 1081644797. The reversal of 1081644775 is 5774461801.

It is not a de Polignac number, because 1081644775 - 2¹³ = 1081636583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91434 + ... + 102583.

Almost surely, 2^1081644775 is an apocalyptic number.

1081644775 is a deficient number, since it is larger than the sum of its proper divisors (265616217).

1081644775 is a wasteful number, since it uses less digits than its factorization.

1081644775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194250 (or 194245 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 1081644775 is about 32888.3683845824. The cubic root of 1081644775 is about 1026.5061419181.

The spelling of 1081644775 in words is "one billion, eighty-one million, six hundred forty-four thousand, seven hundred seventy-five".