211313197 has 2 divisors, whose sum is σ = 211313198. Its totient is φ = 211313196.

The previous prime is 211313189. The next prime is 211313209. The reversal of 211313197 is 791313112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202379076 + 8934121 = 14226^2 + 2989^2 .

It is a cyclic number.

It is not a de Polignac number, because 211313197 - 2³ = 211313189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211313147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105656598 + 105656599.

It is an arithmetic number, because the mean of its divisors is an integer number (105656599).

Almost surely, 2^211313197 is an apocalyptic number.

It is an amenable number.

211313197 is a deficient number, since it is larger than the sum of its proper divisors (1).

211313197 is an equidigital number, since it uses as much as digits as its factorization.

211313197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 28.

The square root of 211313197 is about 14536.6157340696. The cubic root of 211313197 is about 595.6285963219.

The spelling of 211313197 in words is "two hundred eleven million, three hundred thirteen thousand, one hundred ninety-seven".