212317081 has 2 divisors, whose sum is σ = 212317082. Its totient is φ = 212317080.

The previous prime is 212317057. The next prime is 212317111. The reversal of 212317081 is 180713212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143161225 + 69155856 = 11965^2 + 8316^2 .

It is a cyclic number.

It is not a de Polignac number, because 212317081 - 2²¹ = 210219929 is a prime.

It is a super-2 number, since 2×212317081² = 90157085768721122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212317181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106158540 + 106158541.

It is an arithmetic number, because the mean of its divisors is an integer number (106158541).

Almost surely, 2^212317081 is an apocalyptic number.

It is an amenable number.

212317081 is a deficient number, since it is larger than the sum of its proper divisors (1).

212317081 is an equidigital number, since it uses as much as digits as its factorization.

212317081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 212317081 is about 14571.1043164202. The cubic root of 212317081 is about 596.5703226913.

The spelling of 212317081 in words is "two hundred twelve million, three hundred seventeen thousand, eighty-one".