211477979 has 2 divisors, whose sum is σ = 211477980. Its totient is φ = 211477978.

The previous prime is 211477969. The next prime is 211478009. The reversal of 211477979 is 979774112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211477979 - 2⁴ = 211477963 is a prime.

It is not a weakly prime, because it can be changed into another prime (211477969) 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, 105738989 + 105738990.

It is an arithmetic number, because the mean of its divisors is an integer number (105738990).

Almost surely, 2^211477979 is an apocalyptic number.

211477979 is a deficient number, since it is larger than the sum of its proper divisors (1).

211477979 is an equidigital number, since it uses as much as digits as its factorization.

211477979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 222264, while the sum is 47.

The square root of 211477979 is about 14542.2824549656. The cubic root of 211477979 is about 595.7833797929.

The spelling of 211477979 in words is "two hundred eleven million, four hundred seventy-seven thousand, nine hundred seventy-nine".