1284111979 has 6 divisors (see below), whose sum is σ = 1351861260. Its totient is φ = 1216379160.

The previous prime is 1284111937. The next prime is 1284111989. The reversal of 1284111979 is 9791114821.

It is not a de Polignac number, because 1284111979 - 2¹³ = 1284103787 is a prime.

It is a super-2 number, since 2×1284111979² = 3297887149222592882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1284111989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 152089 + ... + 160309.

It is an arithmetic number, because the mean of its divisors is an integer number (225310210).

Almost surely, 2^1284111979 is an apocalyptic number.

1284111979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1284111979 is a deficient number, since it is larger than the sum of its proper divisors (67749281).

1284111979 is an frugal number, since it uses more digits than its factorization.

1284111979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16461 (or 8240 counting only the distinct ones).

The product of its digits is 36288, while the sum is 43.

The square root of 1284111979 is about 35834.5082148479. The cubic root of 1284111979 is about 1086.9284734442.

The spelling of 1284111979 in words is "one billion, two hundred eighty-four million, one hundred eleven thousand, nine hundred seventy-nine".