211201993 has 2 divisors, whose sum is σ = 211201994. Its totient is φ = 211201992.

The previous prime is 211201981. The next prime is 211202003. The reversal of 211201993 is 399102112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196784784 + 14417209 = 14028^2 + 3797^2 .

It is a cyclic number.

It is not a de Polignac number, because 211201993 - 2⁵ = 211201961 is a prime.

It is equal to p_11664208 and since 211201993 and 11664208 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (211201933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105600996 + 105600997.

It is an arithmetic number, because the mean of its divisors is an integer number (105600997).

Almost surely, 2^211201993 is an apocalyptic number.

It is an amenable number.

211201993 is a deficient number, since it is larger than the sum of its proper divisors (1).

211201993 is an equidigital number, since it uses as much as digits as its factorization.

211201993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 211201993 is about 14532.7902689057. The cubic root of 211201993 is about 595.5240944013.

It can be divided in two parts, 2112019 and 93, that added together give a palindrome (2112112).

The spelling of 211201993 in words is "two hundred eleven million, two hundred one thousand, nine hundred ninety-three".