211972487 has 2 divisors, whose sum is σ = 211972488. Its totient is φ = 211972486.

The previous prime is 211972471. The next prime is 211972489. The reversal of 211972487 is 784279112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211972487 - 2⁴ = 211972471 is a prime.

Together with 211972489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211972489) 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, 105986243 + 105986244.

It is an arithmetic number, because the mean of its divisors is an integer number (105986244).

Almost surely, 2^211972487 is an apocalyptic number.

211972487 is a deficient number, since it is larger than the sum of its proper divisors (1).

211972487 is an equidigital number, since it uses as much as digits as its factorization.

211972487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 41.

The square root of 211972487 is about 14559.2749476064. The cubic root of 211972487 is about 596.2474002175.

The spelling of 211972487 in words is "two hundred eleven million, nine hundred seventy-two thousand, four hundred eighty-seven".