212031979 has 2 divisors, whose sum is σ = 212031980. Its totient is φ = 212031978.

The previous prime is 212031977. The next prime is 212031983. The reversal of 212031979 is 979130212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212031979 - 2¹ = 212031977 is a prime.

Together with 212031977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (212031977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106015989 + 106015990.

It is an arithmetic number, because the mean of its divisors is an integer number (106015990).

Almost surely, 2^212031979 is an apocalyptic number.

212031979 is a deficient number, since it is larger than the sum of its proper divisors (1).

212031979 is an equidigital number, since it uses as much as digits as its factorization.

212031979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 212031979 is about 14561.3179005199. The cubic root of 212031979 is about 596.3031757458.

The spelling of 212031979 in words is "two hundred twelve million, thirty-one thousand, nine hundred seventy-nine".