1121444813 has 4 divisors (see below), whose sum is σ = 1121802528. Its totient is φ = 1121087100.

The previous prime is 1121444791. The next prime is 1121444843. The reversal of 1121444813 is 3184441211.

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 1121444813 - 2¹⁶ = 1121379277 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 (1121444843) 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, 174113 + ... + 180438.

It is an arithmetic number, because the mean of its divisors is an integer number (280450632).

Almost surely, 2^1121444813 is an apocalyptic number.

It is an amenable number.

1121444813 is a deficient number, since it is larger than the sum of its proper divisors (357715).

1121444813 is an equidigital number, since it uses as much as digits as its factorization.

1121444813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357714.

The product of its digits is 3072, while the sum is 29.

The square root of 1121444813 is about 33487.9801272039. The cubic root of 1121444813 is about 1038.9451869966.

The spelling of 1121444813 in words is "one billion, one hundred twenty-one million, four hundred forty-four thousand, eight hundred thirteen".