1089944641 has 4 divisors (see below), whose sum is σ = 1102191300. Its totient is φ = 1077697984.

The previous prime is 1089944591. The next prime is 1089944657. The reversal of 1089944641 is 1464499801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1464499801 = 3187 ⋅459523.

It can be written as a sum of positive squares in 2 ways, for example, as 231161616 + 858783025 = 15204^2 + 29305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1089944641 - 2¹¹ = 1089942593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1089944591 and 1089944600.

It is not an unprimeable number, because it can be changed into a prime (1089944941) 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, 6123196 + ... + 6123373.

It is an arithmetic number, because the mean of its divisors is an integer number (275547825).

Almost surely, 2^1089944641 is an apocalyptic number.

It is an amenable number.

1089944641 is a deficient number, since it is larger than the sum of its proper divisors (12246659).

1089944641 is an equidigital number, since it uses as much as digits as its factorization.

1089944641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12246658.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 1089944641 is about 33014.3096399122. The cubic root of 1089944641 is about 1029.1250435555.

The spelling of 1089944641 in words is "one billion, eighty-nine million, nine hundred forty-four thousand, six hundred forty-one".