212565973 has 2 divisors, whose sum is σ = 212565974. Its totient is φ = 212565972.

The previous prime is 212565949. The next prime is 212565989. The reversal of 212565973 is 379565212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211469764 + 1096209 = 14542^2 + 1047^2 .

It is a cyclic number.

It is not a de Polignac number, because 212565973 - 2⁹ = 212565461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212565373) 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, 106282986 + 106282987.

It is an arithmetic number, because the mean of its divisors is an integer number (106282987).

Almost surely, 2^212565973 is an apocalyptic number.

It is an amenable number.

212565973 is a deficient number, since it is larger than the sum of its proper divisors (1).

212565973 is an equidigital number, since it uses as much as digits as its factorization.

212565973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 40.

The square root of 212565973 is about 14579.6424167399. The cubic root of 212565973 is about 596.8033446066.

The spelling of 212565973 in words is "two hundred twelve million, five hundred sixty-five thousand, nine hundred seventy-three".