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8213969 is a prime number
BaseRepresentation
bin11111010101010111010001
3120110022110002
4133111113101
54100321334
6452015345
7126550301
oct37252721
916408402
108213969
114700305
122901555
13191794a
14113b601
15ac3b7e
hex7d55d1

8213969 has 2 divisors, whose sum is σ = 8213970. Its totient is φ = 8213968.

The previous prime is 8213951. The next prime is 8213971. The reversal of 8213969 is 9693128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4558225 + 3655744 = 2135^2 + 1912^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-8213969 is a prime.

It is a super-2 number, since 2×82139692 = 134938573465922, which contains 22 as substring.

Together with 8213971, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8213069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4106984 + 4106985.

It is an arithmetic number, because the mean of its divisors is an integer number (4106985).

Almost surely, 28213969 is an apocalyptic number.

It is an amenable number.

8213969 is a deficient number, since it is larger than the sum of its proper divisors (1).

8213969 is an equidigital number, since it uses as much as digits as its factorization.

8213969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 8213969 is about 2866.0022679684. The cubic root of 8213969 is about 201.7674102965.

The spelling of 8213969 in words is "eight million, two hundred thirteen thousand, nine hundred sixty-nine".