1284228991 has 6 divisors (see below), whose sum is σ = 1289638176. Its totient is φ = 1278842400.

The previous prime is 1284228983. The next prime is 1284229021. The reversal of 1284228991 is 1998224821.

It is a happy number.

It is not a de Polignac number, because 1284228991 - 2³ = 1284228983 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 (1284228941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47026 + ... + 69136.

It is an arithmetic number, because the mean of its divisors is an integer number (214939696).

Almost surely, 2^1284228991 is an apocalyptic number.

1284228991 is a deficient number, since it is larger than the sum of its proper divisors (5409185).

1284228991 is an frugal number, since it uses more digits than its factorization.

1284228991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22593 (or 22352 counting only the distinct ones).

The product of its digits is 165888, while the sum is 46.

The square root of 1284228991 is about 35836.1408497065. The cubic root of 1284228991 is about 1086.9614871309.

The spelling of 1284228991 in words is "one billion, two hundred eighty-four million, two hundred twenty-eight thousand, nine hundred ninety-one".