212409469 has 2 divisors, whose sum is σ = 212409470. Its totient is φ = 212409468.

The previous prime is 212409443. The next prime is 212409481. The reversal of 212409469 is 964904212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124612569 + 87796900 = 11163^2 + 9370^2 .

It is a cyclic number.

It is not a de Polignac number, because 212409469 - 2⁵ = 212409437 is a prime.

It is a super-2 number, since 2×212409469² = 90235565041723922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212409419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106204734 + 106204735.

It is an arithmetic number, because the mean of its divisors is an integer number (106204735).

Almost surely, 2^212409469 is an apocalyptic number.

It is an amenable number.

212409469 is a deficient number, since it is larger than the sum of its proper divisors (1).

212409469 is an equidigital number, since it uses as much as digits as its factorization.

212409469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 212409469 is about 14574.2742186361. The cubic root of 212409469 is about 596.6568410035.

It can be divided in two parts, 212409 and 469, that added together give a triangular number (212878 = T₆₅₂).

The spelling of 212409469 in words is "two hundred twelve million, four hundred nine thousand, four hundred sixty-nine".