212054509 has 2 divisors, whose sum is σ = 212054510. Its totient is φ = 212054508.

The previous prime is 212054489. The next prime is 212054527. The reversal of 212054509 is 905450212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168428484 + 43626025 = 12978^2 + 6605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212054509 is a prime.

It is a super-2 number, since 2×212054509² = 89934229574462162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212054569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106027254 + 106027255.

It is an arithmetic number, because the mean of its divisors is an integer number (106027255).

Almost surely, 2^212054509 is an apocalyptic number.

It is an amenable number.

212054509 is a deficient number, since it is larger than the sum of its proper divisors (1).

212054509 is an equidigital number, since it uses as much as digits as its factorization.

212054509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 212054509 is about 14562.0915050002. The cubic root of 212054509 is about 596.3242955706.

The spelling of 212054509 in words is "two hundred twelve million, fifty-four thousand, five hundred nine".