647275427 has 2 divisors, whose sum is σ = 647275428. Its totient is φ = 647275426.

The previous prime is 647275411. The next prime is 647275429. The reversal of 647275427 is 724572746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647275427 - 2⁴ = 647275411 is a prime.

Together with 647275429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647275429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323637713 + 323637714.

It is an arithmetic number, because the mean of its divisors is an integer number (323637714).

Almost surely, 2^647275427 is an apocalyptic number.

647275427 is a deficient number, since it is larger than the sum of its proper divisors (1).

647275427 is an equidigital number, since it uses as much as digits as its factorization.

647275427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 658560, while the sum is 44.

The square root of 647275427 is about 25441.6081842324. The cubic root of 647275427 is about 865.0270863693.

The spelling of 647275427 in words is "six hundred forty-seven million, two hundred seventy-five thousand, four hundred twenty-seven".