212064311509 has 2 divisors, whose sum is σ = 212064311510. Its totient is φ = 212064311508.

The previous prime is 212064311479. The next prime is 212064311551. The reversal of 212064311509 is 905113460212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112825451025 + 99238860484 = 335895^2 + 315022^2 .

It is a cyclic number.

It is not a de Polignac number, because 212064311509 - 2²³ = 212055922901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212064311579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106032155754 + 106032155755.

It is an arithmetic number, because the mean of its divisors is an integer number (106032155755).

Almost surely, 2^212064311509 is an apocalyptic number.

It is an amenable number.

212064311509 is a deficient number, since it is larger than the sum of its proper divisors (1).

212064311509 is an equidigital number, since it uses as much as digits as its factorization.

212064311509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 212064311509 in words is "two hundred twelve billion, sixty-four million, three hundred eleven thousand, five hundred nine".