1279373581081 has 4 divisors (see below), whose sum is σ = 1280236275472. Its totient is φ = 1278510886692.

The previous prime is 1279373581069. The next prime is 1279373581093. The reversal of 1279373581081 is 1801853739721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1279373581069) and next prime (1279373581093).

It is a cyclic number.

It is not a de Polignac number, because 1279373581081 - 2¹³ = 1279373572889 is a prime.

It is a super-2 number, since 2×1279373581081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279373581481) 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, 431344971 + ... + 431347936.

It is an arithmetic number, because the mean of its divisors is an integer number (320059068868).

Almost surely, 2^{1279373581081} is an apocalyptic number.

It is an amenable number.

1279373581081 is a deficient number, since it is larger than the sum of its proper divisors (862694391).

1279373581081 is an equidigital number, since it uses as much as digits as its factorization.

1279373581081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862694390.

The product of its (nonzero) digits is 2540160, while the sum is 55.

The spelling of 1279373581081 in words is "one trillion, two hundred seventy-nine billion, three hundred seventy-three million, five hundred eighty-one thousand, eighty-one".