79686281 has 2 divisors, whose sum is σ = 79686282. Its totient is φ = 79686280.

The previous prime is 79686241. The next prime is 79686311. The reversal of 79686281 is 18268697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43494025 + 36192256 = 6595^2 + 6016^2 .

It is an emirp because it is prime and its reverse (18268697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79686281 - 2¹⁴ = 79669897 is a prime.

It is a super-2 number, since 2×79686281² = 12699806759221922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79686241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39843140 + 39843141.

It is an arithmetic number, because the mean of its divisors is an integer number (39843141).

Almost surely, 2^79686281 is an apocalyptic number.

It is an amenable number.

79686281 is a deficient number, since it is larger than the sum of its proper divisors (1).

79686281 is an equidigital number, since it uses as much as digits as its factorization.

79686281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 79686281 is about 8926.7172577605. The cubic root of 79686281 is about 430.3229609059.

The spelling of 79686281 in words is "seventy-nine million, six hundred eighty-six thousand, two hundred eighty-one".