2079275921981 has 4 divisors (see below), whose sum is σ = 2079929579964. Its totient is φ = 2078622264000.

The previous prime is 2079275921977. The next prime is 2079275922019. The reversal of 2079275921981 is 1891295729702.

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 340016105881 + 1739259816100 = 583109^2 + 1318810^2 .

It is a cyclic number.

It is not a de Polignac number, because 2079275921981 - 2² = 2079275921977 is a prime.

It is a super-2 number, since 2×2079275921981² (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 (2079275921381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326824220 + ... + 326830581.

It is an arithmetic number, because the mean of its divisors is an integer number (519982394991).

Almost surely, 2^{2079275921981} is an apocalyptic number.

It is an amenable number.

2079275921981 is a deficient number, since it is larger than the sum of its proper divisors (653657983).

2079275921981 is an equidigital number, since it uses as much as digits as its factorization.

2079275921981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653657982.

The product of its (nonzero) digits is 11430720, while the sum is 62.

The spelling of 2079275921981 in words is "two trillion, seventy-nine billion, two hundred seventy-five million, nine hundred twenty-one thousand, nine hundred eighty-one".