646228831 has 2 divisors, whose sum is σ = 646228832. Its totient is φ = 646228830.

The previous prime is 646228771. The next prime is 646228873. The reversal of 646228831 is 138822646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646228831 - 2¹⁷ = 646097759 is a prime.

It is a super-2 number, since 2×646228831² = 835223404031253122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646228031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323114415 + 323114416.

It is an arithmetic number, because the mean of its divisors is an integer number (323114416).

Almost surely, 2^646228831 is an apocalyptic number.

646228831 is a deficient number, since it is larger than the sum of its proper divisors (1).

646228831 is an equidigital number, since it uses as much as digits as its factorization.

646228831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 40.

The square root of 646228831 is about 25421.0312733374. The cubic root of 646228831 is about 864.5606068039.

The spelling of 646228831 in words is "six hundred forty-six million, two hundred twenty-eight thousand, eight hundred thirty-one".