1144786891 has 2 divisors, whose sum is σ = 1144786892. Its totient is φ = 1144786890.

The previous prime is 1144786883. The next prime is 1144786913. The reversal of 1144786891 is 1986874411.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1144786891 - 2³ = 1144786883 is a prime.

It is not a weakly prime, because it can be changed into another prime (1144786831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572393445 + 572393446.

It is an arithmetic number, because the mean of its divisors is an integer number (572393446).

Almost surely, 2^1144786891 is an apocalyptic number.

1144786891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1144786891 is an equidigital number, since it uses as much as digits as its factorization.

1144786891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 49.

The square root of 1144786891 is about 33834.6995110050. The cubic root of 1144786891 is about 1046.1040477814.

The spelling of 1144786891 in words is "one billion, one hundred forty-four million, seven hundred eighty-six thousand, eight hundred ninety-one".