646231427 has 2 divisors, whose sum is σ = 646231428. Its totient is φ = 646231426.

The previous prime is 646231423. The next prime is 646231429. The reversal of 646231427 is 724132646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646231427 - 2² = 646231423 is a prime.

Together with 646231429, 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 (646231423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323115713 + 323115714.

It is an arithmetic number, because the mean of its divisors is an integer number (323115714).

Almost surely, 2^646231427 is an apocalyptic number.

646231427 is a deficient number, since it is larger than the sum of its proper divisors (1).

646231427 is an equidigital number, since it uses as much as digits as its factorization.

646231427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 35.

The square root of 646231427 is about 25421.0823333705. The cubic root of 646231427 is about 864.5617644931.

The spelling of 646231427 in words is "six hundred forty-six million, two hundred thirty-one thousand, four hundred twenty-seven".