1144778993 has 4 divisors (see below), whose sum is σ = 1146106368. Its totient is φ = 1143451620.

The previous prime is 1144778989. The next prime is 1144779011. The reversal of 1144778993 is 3998774411.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1144778993 - 2² = 1144778989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1144778923) 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, 662393 + ... + 664118.

It is an arithmetic number, because the mean of its divisors is an integer number (286526592).

Almost surely, 2^1144778993 is an apocalyptic number.

It is an amenable number.

1144778993 is a deficient number, since it is larger than the sum of its proper divisors (1327375).

1144778993 is an equidigital number, since it uses as much as digits as its factorization.

1144778993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327374.

The product of its digits is 1524096, while the sum is 53.

The square root of 1144778993 is about 33834.5827963047. The cubic root of 1144778993 is about 1046.1016420501.

The spelling of 1144778993 in words is "one billion, one hundred forty-four million, seven hundred seventy-eight thousand, nine hundred ninety-three".