1081291689 has 27 divisors (see below), whose sum is σ = 1592222853. Its totient is φ = 707116032.

The previous prime is 1081291667. The next prime is 1081291711. The reversal of 1081291689 is 9861921801.

The square root of 1081291689 is 32883.

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

It is an interprime number because it is at equal distance from previous prime (1081291667) and next prime (1081291711).

It can be written as a sum of positive squares in 4 ways, for example, as 452285289 + 629006400 = 21267^2 + 25080^2 .

It is not a de Polignac number, because 1081291689 - 2⁵ = 1081291657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1081291639) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9568897 + ... + 9569009.

Almost surely, 2^1081291689 is an apocalyptic number.

1081291689 is the 32883-rd square number.

1081291689 is the 16442-nd centered octagonal number.

It is an amenable number.

1081291689 is a deficient number, since it is larger than the sum of its proper divisors (510931164).

1081291689 is an frugal number, since it uses more digits than its factorization.

1081291689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 45.

The cubic root of 1081291689 is about 1026.3944341433.

The spelling of 1081291689 in words is "one billion, eighty-one million, two hundred ninety-one thousand, six hundred eighty-nine".