1279192486381 has 4 divisors (see below), whose sum is σ = 1310392303164. Its totient is φ = 1247992669600.

The previous prime is 1279192486367. The next prime is 1279192486391. The reversal of 1279192486381 is 1836842919721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 97775661481 + 1181416824900 = 312691^2 + 1086930^2 .

It is not a de Polignac number, because 1279192486381 - 2⁵ = 1279192486349 is a prime.

It is a super-2 number, since 2×1279192486381² (a number of 25 digits) contains 22 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 (1279192486301) 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, 15599908330 + ... + 15599908411.

It is an arithmetic number, because the mean of its divisors is an integer number (327598075791).

Almost surely, 2^{1279192486381} is an apocalyptic number.

It is an amenable number.

1279192486381 is a deficient number, since it is larger than the sum of its proper divisors (31199816783).

1279192486381 is an equidigital number, since it uses as much as digits as its factorization.

1279192486381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31199816782.

The product of its digits is 10450944, while the sum is 61.

The spelling of 1279192486381 in words is "one trillion, two hundred seventy-nine billion, one hundred ninety-two million, four hundred eighty-six thousand, three hundred eighty-one".