212261669 has 2 divisors, whose sum is σ = 212261670. Its totient is φ = 212261668.

The previous prime is 212261659. The next prime is 212261683. The reversal of 212261669 is 966162212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204633025 + 7628644 = 14305^2 + 2762^2 .

It is a cyclic number.

It is not a de Polignac number, because 212261669 - 2²⁴ = 195484453 is a prime.

It is a super-2 number, since 2×212261669² = 90110032253331122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212261659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106130834 + 106130835.

It is an arithmetic number, because the mean of its divisors is an integer number (106130835).

Almost surely, 2^212261669 is an apocalyptic number.

It is an amenable number.

212261669 is a deficient number, since it is larger than the sum of its proper divisors (1).

212261669 is an equidigital number, since it uses as much as digits as its factorization.

212261669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 212261669 is about 14569.2027578725. The cubic root of 212261669 is about 596.5184191409.

The spelling of 212261669 in words is "two hundred twelve million, two hundred sixty-one thousand, six hundred sixty-nine".