2179072681 has 2 divisors, whose sum is σ = 2179072682. Its totient is φ = 2179072680.

The previous prime is 2179072669. The next prime is 2179072717. The reversal of 2179072681 is 1862709712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2147488281 + 31584400 = 46341^2 + 5620^2 .

It is a cyclic number.

It is not a de Polignac number, because 2179072681 - 2²³ = 2170684073 is a prime.

It is a super-2 number, since 2×2179072681² = 9496715498161055522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2179072661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089536340 + 1089536341.

It is an arithmetic number, because the mean of its divisors is an integer number (1089536341).

Almost surely, 2^2179072681 is an apocalyptic number.

It is an amenable number.

2179072681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2179072681 is an equidigital number, since it uses as much as digits as its factorization.

2179072681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 2179072681 is about 46680.5385680157. The cubic root of 2179072681 is about 1296.4543781023.

The spelling of 2179072681 in words is "two billion, one hundred seventy-nine million, seventy-two thousand, six hundred eighty-one".