646231423 has 2 divisors, whose sum is σ = 646231424. Its totient is φ = 646231422.

The previous prime is 646231409. The next prime is 646231427. The reversal of 646231423 is 324132646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646231423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646231427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323115711 + 323115712.

It is an arithmetic number, because the mean of its divisors is an integer number (323115712).

Almost surely, 2^646231423 is an apocalyptic number.

646231423 is a deficient number, since it is larger than the sum of its proper divisors (1).

646231423 is an equidigital number, since it uses as much as digits as its factorization.

646231423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 31.

The square root of 646231423 is about 25421.0822546956. The cubic root of 646231423 is about 864.5617627093.

The spelling of 646231423 in words is "six hundred forty-six million, two hundred thirty-one thousand, four hundred twenty-three".