1279320573541 has 4 divisors (see below), whose sum is σ = 1279325872972. Its totient is φ = 1279315274112.

The previous prime is 1279320573539. The next prime is 1279320573551. The reversal of 1279320573541 is 1453750239721.

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 682647750625 + 596672822916 = 826225^2 + 772446^2 .

It is a cyclic number.

It is not a de Polignac number, because 1279320573541 - 2¹ = 1279320573539 is a prime.

It is a super-2 number, since 2×1279320573541² (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 (1279320573521) 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, 2269410 + ... + 2776483.

It is an arithmetic number, because the mean of its divisors is an integer number (319831468243).

Almost surely, 2^{1279320573541} is an apocalyptic number.

It is an amenable number.

1279320573541 is a deficient number, since it is larger than the sum of its proper divisors (5299431).

1279320573541 is an equidigital number, since it uses as much as digits as its factorization.

1279320573541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5299430.

The product of its (nonzero) digits is 1587600, while the sum is 49.

The spelling of 1279320573541 in words is "one trillion, two hundred seventy-nine billion, three hundred twenty million, five hundred seventy-three thousand, five hundred forty-one".