1090471861 has 4 divisors (see below), whose sum is σ = 1100476300. Its totient is φ = 1080467424.

The previous prime is 1090471859. The next prime is 1090471867. The reversal of 1090471861 is 1681740901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1681740901 = 19 ⋅88512679.

It can be written as a sum of positive squares in 2 ways, for example, as 780923025 + 309548836 = 27945^2 + 17594^2 .

It is a cyclic number.

It is not a de Polignac number, because 1090471861 - 2¹ = 1090471859 is a prime.

It is a Duffinian number.

1090471861 is a modest number, since divided by 471861 gives 1090 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 1090471861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1090471867) 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, 5002056 + ... + 5002273.

It is an arithmetic number, because the mean of its divisors is an integer number (275119075).

Almost surely, 2^1090471861 is an apocalyptic number.

It is an amenable number.

1090471861 is a deficient number, since it is larger than the sum of its proper divisors (10004439).

1090471861 is a wasteful number, since it uses less digits than its factorization.

1090471861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10004438.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 1090471861 is about 33022.2933940088. The cubic root of 1090471861 is about 1029.2909504053.

The spelling of 1090471861 in words is "one billion, ninety million, four hundred seventy-one thousand, eight hundred sixty-one".