164253809 has 2 divisors, whose sum is σ = 164253810. Its totient is φ = 164253808.

The previous prime is 164253797. The next prime is 164253811. The reversal of 164253809 is 908352461.

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., 164224225 + 29584 = 12815^2 + 172^2 .

It is a cyclic number.

It is not a de Polignac number, because 164253809 - 2¹⁶ = 164188273 is a prime.

Together with 164253811, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_9199532 and since 164253809 and 9199532 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (164253409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82126904 + 82126905.

It is an arithmetic number, because the mean of its divisors is an integer number (82126905).

Almost surely, 2^164253809 is an apocalyptic number.

It is an amenable number.

164253809 is a deficient number, since it is larger than the sum of its proper divisors (1).

164253809 is an equidigital number, since it uses as much as digits as its factorization.

164253809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 164253809 is about 12816.1542203580. The cubic root of 164253809 is about 547.6525949561.

The spelling of 164253809 in words is "one hundred sixty-four million, two hundred fifty-three thousand, eight hundred nine".