427164509 has 2 divisors, whose sum is σ = 427164510. Its totient is φ = 427164508.

The previous prime is 427164499. The next prime is 427164511. The reversal of 427164509 is 905461724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289102009 + 138062500 = 17003^2 + 11750^2 .

It is a cyclic number.

It is not a de Polignac number, because 427164509 - 2²⁰ = 426115933 is a prime.

It is a super-2 number, since 2×427164509² = 364939035498422162, which contains 22 as substring.

Together with 427164511, 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 (427164539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213582254 + 213582255.

It is an arithmetic number, because the mean of its divisors is an integer number (213582255).

Almost surely, 2^427164509 is an apocalyptic number.

It is an amenable number.

427164509 is a deficient number, since it is larger than the sum of its proper divisors (1).

427164509 is an equidigital number, since it uses as much as digits as its factorization.

427164509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 427164509 is about 20667.9585106996. The cubic root of 427164509 is about 753.1215140280.

The spelling of 427164509 in words is "four hundred twenty-seven million, one hundred sixty-four thousand, five hundred nine".