1151234789 has 4 divisors (see below), whose sum is σ = 1151311980. Its totient is φ = 1151157600.

The previous prime is 1151234767. The next prime is 1151234809. The reversal of 1151234789 is 9874321511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9874321511 = 67 ⋅147377933.

It can be written as a sum of positive squares in 2 ways, for example, as 381616225 + 769618564 = 19535^2 + 27742^2 .

It is a cyclic number.

It is not a de Polignac number, because 1151234789 - 2⁸ = 1151234533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151234729) 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, 8294 + ... + 48695.

It is an arithmetic number, because the mean of its divisors is an integer number (287827995).

Almost surely, 2^1151234789 is an apocalyptic number.

It is an amenable number.

1151234789 is a deficient number, since it is larger than the sum of its proper divisors (77191).

1151234789 is an equidigital number, since it uses as much as digits as its factorization.

1151234789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77190.

The product of its digits is 60480, while the sum is 41.

The square root of 1151234789 is about 33929.8510017359. The cubic root of 1151234789 is about 1048.0643974593.

The spelling of 1151234789 in words is "one billion, one hundred fifty-one million, two hundred thirty-four thousand, seven hundred eighty-nine".