1091839849 has 9 divisors (see below), whose sum is σ = 1103967319. Its totient is φ = 1079845240.

The previous prime is 1091839843. The next prime is 1091839867. The reversal of 1091839849 is 9489381901.

The square root of 1091839849 is 33043.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 993195225 + 98644624 = 31515^2 + 9932^2 .

It is not a de Polignac number, because 1091839849 - 2²¹ = 1089742697 is a prime.

It is a super-2 number, since 2×1091839849² = 2384228511728685602, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1091839796 and 1091839805.

It is not an unprimeable number, because it can be changed into a prime (1091839843) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5716344 + ... + 5716534.

Almost surely, 2^1091839849 is an apocalyptic number.

1091839849 is the 33043-rd square number.

1091839849 is the 16522-nd centered octagonal number.

It is an amenable number.

1091839849 is a deficient number, since it is larger than the sum of its proper divisors (12127470).

1091839849 is an frugal number, since it uses more digits than its factorization.

1091839849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 52.

The cubic root of 1091839849 is about 1029.7211828976.

The spelling of 1091839849 in words is "one billion, ninety-one million, eight hundred thirty-nine thousand, eight hundred forty-nine".