1129581389 has 4 divisors (see below), whose sum is σ = 1132190556. Its totient is φ = 1126972224.

The previous prime is 1129581377. The next prime is 1129581413. The reversal of 1129581389 is 9831859211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9831859211 = 7793 ⋅1261627.

It can be written as a sum of positive squares in 2 ways, for example, as 85192900 + 1044388489 = 9230^2 + 32317^2 .

It is a cyclic number.

It is not a de Polignac number, because 1129581389 - 2²⁰ = 1128532813 is a prime.

It is a super-2 number, since 2×1129581389² = 2551908228750338642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1129581289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1303934 + ... + 1304799.

It is an arithmetic number, because the mean of its divisors is an integer number (283047639).

Almost surely, 2^1129581389 is an apocalyptic number.

It is an amenable number.

1129581389 is a deficient number, since it is larger than the sum of its proper divisors (2609167).

1129581389 is an equidigital number, since it uses as much as digits as its factorization.

1129581389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609166.

The product of its digits is 155520, while the sum is 47.

The square root of 1129581389 is about 33609.2455880819. The cubic root of 1129581389 is about 1041.4518028285.

The spelling of 1129581389 in words is "one billion, one hundred twenty-nine million, five hundred eighty-one thousand, three hundred eighty-nine".