211741993 has 2 divisors, whose sum is σ = 211741994. Its totient is φ = 211741992.

The previous prime is 211741967. The next prime is 211742033. The reversal of 211741993 is 399147112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210917529 + 824464 = 14523^2 + 908^2 .

It is a cyclic number.

It is not a de Polignac number, because 211741993 - 2⁵ = 211741961 is a prime.

It is a super-2 number, since 2×211741993² = 89669343199224098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211741903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105870996 + 105870997.

It is an arithmetic number, because the mean of its divisors is an integer number (105870997).

Almost surely, 2^211741993 is an apocalyptic number.

It is an amenable number.

211741993 is a deficient number, since it is larger than the sum of its proper divisors (1).

211741993 is an equidigital number, since it uses as much as digits as its factorization.

211741993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 211741993 is about 14551.3570844784. The cubic root of 211741993 is about 596.0312066074.

The spelling of 211741993 in words is "two hundred eleven million, seven hundred forty-one thousand, nine hundred ninety-three".