1151231689 has 4 divisors (see below), whose sum is σ = 1151817156. Its totient is φ = 1150646224.

The previous prime is 1151231639. The next prime is 1151231699. The reversal of 1151231689 is 9861321511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9861321511 = 37 ⋅266522203.

It can be written as a sum of positive squares in 2 ways, for example, as 182466064 + 968765625 = 13508^2 + 31125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1151231689 - 2¹³ = 1151223497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1151231629) 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, 289774 + ... + 293719.

It is an arithmetic number, because the mean of its divisors is an integer number (287954289).

Almost surely, 2^1151231689 is an apocalyptic number.

It is an amenable number.

1151231689 is a deficient number, since it is larger than the sum of its proper divisors (585467).

1151231689 is an equidigital number, since it uses as much as digits as its factorization.

1151231689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585466.

The product of its digits is 12960, while the sum is 37.

The square root of 1151231689 is about 33929.8053192175. The cubic root of 1151231689 is about 1048.0634567295.

The spelling of 1151231689 in words is "one billion, one hundred fifty-one million, two hundred thirty-one thousand, six hundred eighty-nine".