1121658789 has 16 divisors (see below), whose sum is σ = 1523989760. Its totient is φ = 733613760.

The previous prime is 1121658757. The next prime is 1121658823. The reversal of 1121658789 is 9878561211.

It is a happy number.

It is not a de Polignac number, because 1121658789 - 2⁵ = 1121658757 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 (1121658289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64932 + ... + 80370.

It is an arithmetic number, because the mean of its divisors is an integer number (95249360).

Almost surely, 2^1121658789 is an apocalyptic number.

It is an amenable number.

1121658789 is a deficient number, since it is larger than the sum of its proper divisors (402330971).

1121658789 is a wasteful number, since it uses less digits than its factorization.

1121658789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15900.

The product of its digits is 241920, while the sum is 48.

The square root of 1121658789 is about 33491.1747927719. The cubic root of 1121658789 is about 1039.0112610453.

The spelling of 1121658789 in words is "one billion, one hundred twenty-one million, six hundred fifty-eight thousand, seven hundred eighty-nine".