212161669 has 2 divisors, whose sum is σ = 212161670. Its totient is φ = 212161668.

The previous prime is 212161627. The next prime is 212161673. The reversal of 212161669 is 966161212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188512900 + 23648769 = 13730^2 + 4863^2 .

It is a cyclic number.

It is not a de Polignac number, because 212161669 - 2¹³ = 212153477 is a prime.

It is a super-2 number, since 2×212161669² = 90025147585731122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212161679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106080834 + 106080835.

It is an arithmetic number, because the mean of its divisors is an integer number (106080835).

Almost surely, 2^212161669 is an apocalyptic number.

It is an amenable number.

212161669 is a deficient number, since it is larger than the sum of its proper divisors (1).

212161669 is an equidigital number, since it uses as much as digits as its factorization.

212161669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 34.

The square root of 212161669 is about 14565.7704567936. The cubic root of 212161669 is about 596.4247278458.

The spelling of 212161669 in words is "two hundred twelve million, one hundred sixty-one thousand, six hundred sixty-nine".