212239897 has 2 divisors, whose sum is σ = 212239898. Its totient is φ = 212239896.

The previous prime is 212239891. The next prime is 212239901. The reversal of 212239897 is 798932212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211149961 + 1089936 = 14531^2 + 1044^2 .

It is a cyclic number.

It is not a de Polignac number, because 212239897 - 2³ = 212239889 is a prime.

It is not a weakly prime, because it can be changed into another prime (212239891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106119948 + 106119949.

It is an arithmetic number, because the mean of its divisors is an integer number (106119949).

Almost surely, 2^212239897 is an apocalyptic number.

It is an amenable number.

212239897 is a deficient number, since it is larger than the sum of its proper divisors (1).

212239897 is an equidigital number, since it uses as much as digits as its factorization.

212239897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 212239897 is about 14568.4555461449. The cubic root of 212239897 is about 596.4980231784.

The spelling of 212239897 in words is "two hundred twelve million, two hundred thirty-nine thousand, eight hundred ninety-seven".