211198987 has 2 divisors, whose sum is σ = 211198988. Its totient is φ = 211198986.

The previous prime is 211198961. The next prime is 211198991. The reversal of 211198987 is 789891112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211198987 - 2⁷ = 211198859 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211198787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105599493 + 105599494.

It is an arithmetic number, because the mean of its divisors is an integer number (105599494).

Almost surely, 2^211198987 is an apocalyptic number.

211198987 is a deficient number, since it is larger than the sum of its proper divisors (1).

211198987 is an equidigital number, since it uses as much as digits as its factorization.

211198987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 46.

The square root of 211198987 is about 14532.6868472420. The cubic root of 211198987 is about 595.5212690588.

The spelling of 211198987 in words is "two hundred eleven million, one hundred ninety-eight thousand, nine hundred eighty-seven".