1228791983 has 4 divisors (see below), whose sum is σ = 1230816960. Its totient is φ = 1226767008.

The previous prime is 1228791961. The next prime is 1228792001. The reversal of 1228791983 is 3891978221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1228791983 - 2⁸ = 1228791727 is a prime.

It is a super-4 number, since 4×1228791983⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228791913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1011578 + ... + 1012791.

It is an arithmetic number, because the mean of its divisors is an integer number (307704240).

Almost surely, 2^1228791983 is an apocalyptic number.

1228791983 is a deficient number, since it is larger than the sum of its proper divisors (2024977).

1228791983 is an equidigital number, since it uses as much as digits as its factorization.

1228791983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024976.

The product of its digits is 435456, while the sum is 50.

The square root of 1228791983 is about 35054.1293287966. The cubic root of 1228791983 is about 1071.0903907670.

The spelling of 1228791983 in words is "one billion, two hundred twenty-eight million, seven hundred ninety-one thousand, nine hundred eighty-three".