212565497 has 2 divisors, whose sum is σ = 212565498. Its totient is φ = 212565496.

The previous prime is 212565487. The next prime is 212565523. The reversal of 212565497 is 794565212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111281401 + 101284096 = 10549^2 + 10064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212565497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212565487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106282748 + 106282749.

It is an arithmetic number, because the mean of its divisors is an integer number (106282749).

Almost surely, 2^212565497 is an apocalyptic number.

It is an amenable number.

212565497 is a deficient number, since it is larger than the sum of its proper divisors (1).

212565497 is an equidigital number, since it uses as much as digits as its factorization.

212565497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 41.

The square root of 212565497 is about 14579.6260925992. The cubic root of 212565497 is about 596.8028991314.

The spelling of 212565497 in words is "two hundred twelve million, five hundred sixty-five thousand, four hundred ninety-seven".