1146778889 has 4 divisors (see below), whose sum is σ = 1146852756. Its totient is φ = 1146705024.

The previous prime is 1146778849. The next prime is 1146778907. The reversal of 1146778889 is 9888776411.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 1115025664 + 31753225 = 33392^2 + 5635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1146778889 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1146778819) 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, 3644 + ... + 48029.

It is an arithmetic number, because the mean of its divisors is an integer number (286713189).

Almost surely, 2^1146778889 is an apocalyptic number.

It is an amenable number.

1146778889 is a deficient number, since it is larger than the sum of its proper divisors (73867).

1146778889 is an equidigital number, since it uses as much as digits as its factorization.

1146778889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73866.

The product of its digits is 5419008, while the sum is 59.

The square root of 1146778889 is about 33864.1239219325. The cubic root of 1146778889 is about 1046.7104574946.

The spelling of 1146778889 in words is "one billion, one hundred forty-six million, seven hundred seventy-eight thousand, eight hundred eighty-nine".