1279981955 has 8 divisors (see below), whose sum is σ = 1755403872. Its totient is φ = 877701888.

The previous prime is 1279981943. The next prime is 1279981991. The reversal of 1279981955 is 5591899721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1279981955 - 2⁴ = 1279981939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1279981955.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18285422 + ... + 18285491.

It is an arithmetic number, because the mean of its divisors is an integer number (219425484).

Almost surely, 2^1279981955 is an apocalyptic number.

1279981955 is a deficient number, since it is larger than the sum of its proper divisors (475421917).

1279981955 is an equidigital number, since it uses as much as digits as its factorization.

1279981955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36570925.

The product of its digits is 2041200, while the sum is 56.

The square root of 1279981955 is about 35776.8354525662. The cubic root of 1279981955 is about 1085.7619443571.

The spelling of 1279981955 in words is "one billion, two hundred seventy-nine million, nine hundred eighty-one thousand, nine hundred fifty-five".