5631979 has 2 divisors, whose sum is σ = 5631980. Its totient is φ = 5631978.

The previous prime is 5631973. The next prime is 5631991. The reversal of 5631979 is 9791365.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5631979 - 2⁷ = 5631851 is a prime.

5631979 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (5631973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2815989 + 2815990.

It is an arithmetic number, because the mean of its divisors is an integer number (2815990).

Almost surely, 2^5631979 is an apocalyptic number.

5631979 is a deficient number, since it is larger than the sum of its proper divisors (1).

5631979 is an equidigital number, since it uses as much as digits as its factorization.

5631979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51030, while the sum is 40.

The square root of 5631979 is about 2373.1790914299. The cubic root of 5631979 is about 177.9181861109.

The spelling of 5631979 in words is "five million, six hundred thirty-one thousand, nine hundred seventy-nine".