8631979 has 2 divisors, whose sum is σ = 8631980. Its totient is φ = 8631978.

The previous prime is 8631977. The next prime is 8632003. The reversal of 8631979 is 9791368.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8631979 - 2¹ = 8631977 is a prime.

It is a super-2 number, since 2×8631979² = 149022122912882, which contains 22 as substring.

Together with 8631977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8631977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4315989 + 4315990.

It is an arithmetic number, because the mean of its divisors is an integer number (4315990).

Almost surely, 2^8631979 is an apocalyptic number.

8631979 is a deficient number, since it is larger than the sum of its proper divisors (1).

8631979 is an equidigital number, since it uses as much as digits as its factorization.

8631979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 8631979 is about 2938.0229747230. The cubic root of 8631979 is about 205.1335952511.

The spelling of 8631979 in words is "eight million, six hundred thirty-one thousand, nine hundred seventy-nine".