211897523 has 2 divisors, whose sum is σ = 211897524. Its totient is φ = 211897522.

The previous prime is 211897457. The next prime is 211897531. The reversal of 211897523 is 325798112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211897523 - 2¹⁴ = 211881139 is a prime.

It is not a weakly prime, because it can be changed into another prime (211897723) 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, 105948761 + 105948762.

It is an arithmetic number, because the mean of its divisors is an integer number (105948762).

Almost surely, 2^211897523 is an apocalyptic number.

211897523 is a deficient number, since it is larger than the sum of its proper divisors (1).

211897523 is an equidigital number, since it uses as much as digits as its factorization.

211897523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 211897523 is about 14556.7002785659. The cubic root of 211897523 is about 596.1771043648.

The spelling of 211897523 in words is "two hundred eleven million, eight hundred ninety-seven thousand, five hundred twenty-three".